can not find <execinfo.h> when setup mlpack - c++

I tried to install mlpack in cygwin and I have already installed armadillo, but I encountered following problems:
After running cmake ../ I run the make command and here is the process:
$ make
Scanning dependencies of target mlpack_headers
Moving header files to include/mlpack/
[ 0%] Built target mlpack_headers
Scanning dependencies of target mlpack
[ 0%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/dists/discrete_distribution.cpp.o
[ 1%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/dists/gaussian_distribution.cpp.o
[ 2%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/dists/laplace_distribution.cpp.o
[ 3%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/kernels/epanechnikov_kernel.cpp.o
[ 4%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/kernels/pspectrum_string_kernel.cpp.o
[ 5%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/math/lin_alg.cpp.o
[ 6%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/math/random.cpp.o
[ 6%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/optimizers/aug_lagrangian/aug_lagrangian_test_functions.cpp.o
[ 7%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/optimizers/lbfgs/test_functions.cpp.o
[ 8%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/optimizers/lrsdp/lrsdp.cpp.o
[ 9%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/optimizers/lrsdp/lrsdp_function.cpp.o
[ 10%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/optimizers/sgd/test_function.cpp.o
[ 11%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/tree/cosine_tree/cosine_tree.cpp.o
[ 12%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/tree/mrkd_statistic.cpp.o
[ 12%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/util/cli.cpp.o
[ 13%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/util/cli_deleter.cpp.o
[ 14%] Building CXX object src/mlpack/CMakeFiles/mlpack.dir/core/util/log.cpp.o
/home/Administrator/mlpack-1.0.11/mlpack-1.0.11/src/mlpack/core/util/log.cpp:24:24: 致命错误：execinfo.h：No such file or directory
#include <execinfo.h>
编译中断。
src/mlpack/CMakeFiles/mlpack.dir/build.make:425: recipe for target 'src/mlpack/CMakeFiles/mlpack.dir/core/util/log.cpp.o' failed
make[2]: * [src/mlpack/CMakeFiles/mlpack.dir/core/util/log.cpp.o] Error 1
CMakeFiles/Makefile2:119: recipe for target 'src/mlpack/CMakeFiles/mlpack.dir/all' failed
make[1]: * [src/mlpack/CMakeFiles/mlpack.dir/all] Error 2
Makefile:116: recipe for target 'all' failed
make: * [all] Error 2
I don't know how to deal with this problem.


Cygwin's gnulib does not provide execinfo.h, possibly due to compatibility issues with the underlying (Windows) system.
From the gnulib documentation:
This header file is missing on some platforms: Mac OS X 10.3, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin, mingw, MSVC 9, Interix 3.5, BeOS.
You may want to try a WinAPI function like CaptureStackBackTrace instead.

Related

NLOPT importing and using C++

I have been trying on and off for the past year to import the NLopt library into my work. I have been unsuccessful, and I am desperate for help.
Here is some of my CMAKE file
cmake_minimum_required(VERSION 3.21)
project(DynamicRRT)
set(CMAKE_CXX_STANDARD 17)
set(CONAN_CMAKE_CXX_STANDARD 17)
include_directories(/opt/homebrew/Cellar/eigen/3.4.0_1/include/eigen3/)
find_library(nlopt /Users/brandon/Extern/nlopt_install/ NAMES libnlopt nlopt NLopt)
include_directories(/Users/brandon/Extern/nlopt_install/include/ )
link_directories(/Users/brandon/Extern/nlopt_install/include/ )
#INCLUDE_DIRECTORIES(/Users/brandon/CLionProjects/nlopt/)
#INCLUDE_DIRECTORIES(/opt/homebrew/Cellar/nlopt/2.7.1/include/)
#include_directories(/usr/local/include/)
#add_library(nlopt /Users/brandon/Extern/nlopt_install/include)
#add_compile_options(-Wa,-mbig-obj)¡
add_executable(DynamicRRT main.cpp utilities.cpp utilities.h rrt_star.cpp rrt_star.h tree.cpp tree.h Nodes.cpp Nodes.h Obstacles.cpp Obstacles.h macro_rrt_star.cpp macro_rrt_star.h collisions.cpp collisions.h dynamic_rrt_star.cpp dynamic_rrt_star.h trajectory.cpp trajectory.h transformer.cpp transformer.h print_utilities.cpp print_utilities.h random_utilities.cpp random_utilities.h)# inverse_kinematics.cpp inverse_kinematics.h)# rrt_star.cpp rrt_star.h)#rrt_star_util.cpp rrt_star_util.h
target_link_libraries(DynamicRRT nlopt)
You can see that I've commented out a number of attempts at getting this imported. CMake does not throw any errors. However, if I try building the project, I get:
/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake --build /Users/brandonmeng/CLionProjects/DynamicRRT/cmake-build-default-gcc --target all -- -j 8
[ 14%] Building CXX object CMakeFiles/DynamicRRT.dir/Obstacles.cpp.o
[ 14%] Building CXX object CMakeFiles/DynamicRRT.dir/utilities.cpp.o
[ 35%] Building CXX object CMakeFiles/DynamicRRT.dir/rrt_star.cpp.o
[ 35%] Building CXX object CMakeFiles/DynamicRRT.dir/macro_rrt_star.cpp.o
[ 35%] Building CXX object CMakeFiles/DynamicRRT.dir/Nodes.cpp.o
[ 42%] Building CXX object CMakeFiles/DynamicRRT.dir/main.cpp.o
[ 50%] Building CXX object CMakeFiles/DynamicRRT.dir/tree.cpp.o
[ 57%] Building CXX object CMakeFiles/DynamicRRT.dir/collisions.cpp.o
[ 64%] Building CXX object CMakeFiles/DynamicRRT.dir/dynamic_rrt_star.cpp.o
[ 71%] Building CXX object CMakeFiles/DynamicRRT.dir/trajectory.cpp.o
[ 78%] Building CXX object CMakeFiles/DynamicRRT.dir/transformer.cpp.o
[ 85%] Building CXX object CMakeFiles/DynamicRRT.dir/print_utilities.cpp.o
[ 92%] Building CXX object CMakeFiles/DynamicRRT.dir/random_utilities.cpp.o
[100%] Linking CXX executable bin/DynamicRRT
ld: library not found for -lnlopt
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [bin/DynamicRRT] Error 1
make[1]: *** [CMakeFiles/DynamicRRT.dir/all] Error 2
make: *** [all] Error 2

link_directories(/Users/brandon/Extern/nlopt_install/include/ )
The library to link with is likely not in the include directory with the header files. It's more likely they're in a lib directory:
link_directories(/Users/brandon/Extern/nlopt_install/lib)

error with jrtplib 3.11

I need help. I try to build JRTPLIB 3.1.1 with SRTP 2.1.0 and OpenSSL 1.1.0 but got linker error while try to make JRTPLIB.
Dependencies:
Debian 9 (also tried on Ubuntu 16.04 LTS)
JRTPLIB v.3_1_11(from git+changes)
JTHREAD v.1_3_3 (from git)
LIBSRTP v.2_1_0 (by tag)
LIBSSL v.1_1_0 Stable (by branch)
Source changes:
JRTPLIB v.3_1_11 (from git): changed srtp to srtp2; link to lib source archive: https://drive.google.com/drive/folders/0B_Q0HXvHrCzabVpsSUp0TXNka1U?usp=sharing
Cmake settings (image cmake_JRTPLIB.JPG): https://drive.google.com/drive/folders/0B_Q0HXvHrCzabVpsSUp0TXNka1U?usp=sharing
Build:
1)OpenSSL:
build from source and also tried on a Virtual Machine to install libssl1.1 and libssl-dev by sudo apt-get install libssl1.1 libssl-dev)
2)libSRTP:
$./configure --enable-debug-logging --enable-log-stdout --enable-openssl
3)JTHREAD: build with cmake
4)JRTPLIB: Cmake config - see image cmake_JRTPLIB.JPG
$make
Error log:
Scanning dependencies of target jrtplib-static
[ 1%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpapppacket.cpp.o
[ 2%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpbyepacket.cpp.o
[ 3%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpcompoundpacket.cpp.o
[ 4%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpcompoundpacketbuilder.cpp.o
[ 4%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcppacket.cpp.o
[ 5%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcppacketbuilder.cpp.o
[ 6%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcprrpacket.cpp.o
[ 7%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpscheduler.cpp.o
[ 8%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpsdesinfo.cpp.o
[ 8%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpsdespacket.cpp.o
[ 9%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtcpsrpacket.cpp.o
[ 10%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpcollisionlist.cpp.o
[ 11%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpdebug.cpp.o
[ 12%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtperrors.cpp.o
[ 12%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpinternalsourcedata.cpp.o
[ 13%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpipv4address.cpp.o
[ 14%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpipv6address.cpp.o
[ 15%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpipv4destination.cpp.o
[ 16%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpipv6destination.cpp.o
[ 16%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtplibraryversion.cpp.o
[ 17%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtppacket.cpp.o
[ 18%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtppacketbuilder.cpp.o
[ 19%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtppollthread.cpp.o
[ 20%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtprandom.cpp.o
[ 20%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtprandomrand48.cpp.o
[ 21%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtprandomrands.cpp.o
[ 22%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtprandomurandom.cpp.o
[ 23%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpsession.cpp.o
[ 24%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpsessionparams.cpp.o
[ 25%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpsessionsources.cpp.o
[ 25%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpsourcedata.cpp.o
[ 26%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpsources.cpp.o
[ 27%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtptimeutilities.cpp.o
[ 28%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpudpv4transmitter.cpp.o
[ 29%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpudpv6transmitter.cpp.o
[ 29%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpbyteaddress.cpp.o
[ 30%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpexternaltransmitter.cpp.o
[ 31%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpsecuresession.cpp.o
[ 32%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtpabortdescriptors.cpp.o
[ 33%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtptcpaddress.cpp.o
[ 33%] Building CXX object src/CMakeFiles/jrtplib-static.dir/rtptcptransmitter.cpp.o
[ 34%] Building CXX object src/CMakeFiles/jrtplib-static.dir/extratransmitters/rtpfaketransmitter.cpp.o
[ 35%] Linking CXX static library libjrtp.a
[ 35%] Built target jrtplib-static
Scanning dependencies of target jrtplib-shared
[ 35%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpapppacket.cpp.o
[ 36%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpbyepacket.cpp.o
[ 37%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpcompoundpacket.cpp.o
[ 38%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpcompoundpacketbuilder.cpp.o
[ 39%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcppacket.cpp.o
[ 39%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcppacketbuilder.cpp.o
[ 40%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcprrpacket.cpp.o
[ 41%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpscheduler.cpp.o
[ 42%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpsdesinfo.cpp.o
[ 43%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpsdespacket.cpp.o
[ 44%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtcpsrpacket.cpp.o
[ 44%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpcollisionlist.cpp.o
[ 45%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpdebug.cpp.o
[ 46%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtperrors.cpp.o
[ 47%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpinternalsourcedata.cpp.o
[ 48%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpipv4address.cpp.o
[ 48%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpipv6address.cpp.o
[ 49%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpipv4destination.cpp.o
[ 50%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpipv6destination.cpp.o
[ 51%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtplibraryversion.cpp.o
[ 52%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtppacket.cpp.o
[ 52%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtppacketbuilder.cpp.o
[ 53%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtppollthread.cpp.o
[ 54%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtprandom.cpp.o
[ 55%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtprandomrand48.cpp.o
[ 56%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtprandomrands.cpp.o
[ 56%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtprandomurandom.cpp.o
[ 57%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpsession.cpp.o
[ 58%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpsessionparams.cpp.o
[ 59%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpsessionsources.cpp.o
[ 60%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpsourcedata.cpp.o
[ 60%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpsources.cpp.o
[ 61%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtptimeutilities.cpp.o
[ 62%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpudpv4transmitter.cpp.o
[ 63%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpudpv6transmitter.cpp.o
[ 64%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpbyteaddress.cpp.o
[ 64%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpexternaltransmitter.cpp.o
[ 65%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpsecuresession.cpp.o
[ 66%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtpabortdescriptors.cpp.o
[ 67%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtptcpaddress.cpp.o
[ 68%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/rtptcptransmitter.cpp.o
[ 69%] Building CXX object src/CMakeFiles/jrtplib-shared.dir/extratransmitters/rtpfaketransmitter.cpp.o
[ 69%] Linking CXX shared library libjrtp.so
[ 69%] Built target jrtplib-shared
Scanning dependencies of target example4
[ 69%] Building CXX object examples/CMakeFiles/example4.dir/example4.cpp.o
[ 70%] Linking CXX executable example4
[ 70%] Built target example4
Scanning dependencies of target example2
[ 71%] Building CXX object examples/CMakeFiles/example2.dir/example2.cpp.o
[ 72%] Linking CXX executable example2
[ 72%] Built target example2
Scanning dependencies of target example5
[ 73%] Building CXX object examples/CMakeFiles/example5.dir/example5.cpp.o
[ 74%] Linking CXX executable example5
[ 74%] Built target example5
Scanning dependencies of target example8
[ 75%] Building CXX object examples/CMakeFiles/example8.dir/example8.cpp.o
[ 76%] Linking CXX executable example8
[ 76%] Built target example8
Scanning dependencies of target example1
[ 77%] Building CXX object examples/CMakeFiles/example1.dir/example1.cpp.o
[ 77%] Linking CXX executable example1
[ 77%] Built target example1
Scanning dependencies of target example6
[ 78%] Building CXX object examples/CMakeFiles/example6.dir/example6.cpp.o
[ 78%] Linking CXX executable example6
[ 78%] Built target example6
Scanning dependencies of target example7
[ 79%] Building CXX object examples/CMakeFiles/example7.dir/example7.cpp.o
[ 80%] Linking CXX executable example7
/usr/local/lib/libsrtp2.a(datatypes.o): In function octet_string_set_to_zero': datatypes.c:(.text+0x1d91): undefined reference toOPENSSL_cleanse'
/usr/local/lib/libsrtp2.a(aes_icm_ossl.o): In function srtp_aes_icm_openssl_set_iv': aes_icm_ossl.c:(.text+0x77): undefined reference toEVP_EncryptInit_ex'
/usr/local/lib/libsrtp2.a(aes_icm_ossl.o): In function srtp_aes_icm_openssl_encrypt': aes_icm_ossl.c:(.text+0xe8): undefined reference toEVP_EncryptUpdate'
aes_icm_ossl.c:(.text+0x113): undefined reference to EVP_EncryptFinal_ex' /usr/local/lib/libsrtp2.a(aes_icm_ossl.o): In functionsrtp_aes_icm_openssl_context_init':
aes_icm_ossl.c:(.text+0x1f9): undefined reference to EVP_aes_128_ctr' aes_icm_ossl.c:(.text+0x20d): undefined reference toEVP_EncryptInit_ex'
aes_icm_ossl.c:(.text+0x231): undefined reference to EVP_aes_256_ctr' aes_icm_ossl.c:(.text+0x241): undefined reference toEVP_aes_192_ctr'
/usr/local/lib/libsrtp2.a(aes_icm_ossl.o): In function srtp_aes_icm_openssl_dealloc': aes_icm_ossl.c:(.text+0x26c): undefined reference toEVP_CIPHER_CTX_free'
/usr/local/lib/libsrtp2.a(aes_icm_ossl.o): In function srtp_aes_icm_openssl_alloc': aes_icm_ossl.c:(.text+0x36a): undefined reference toEVP_CIPHER_CTX_new'
/usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In function srtp_aes_gcm_openssl_get_tag': aes_gcm_ossl.c:(.text+0x18): undefined reference toEVP_Cipher'
aes_gcm_ossl.c:(.text+0x2c): undefined reference to EVP_CIPHER_CTX_ctrl' /usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In functionsrtp_aes_gcm_openssl_set_aad':
aes_gcm_ossl.c:(.text+0x71): undefined reference to EVP_CIPHER_CTX_ctrl' aes_gcm_ossl.c:(.text+0x81): undefined reference toEVP_Cipher'
/usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In function srtp_aes_gcm_openssl_context_init': aes_gcm_ossl.c:(.text+0xeb): undefined reference toEVP_aes_256_gcm'
aes_gcm_ossl.c:(.text+0x102): undefined reference to EVP_CipherInit_ex' aes_gcm_ossl.c:(.text+0x129): undefined reference toEVP_aes_128_gcm'
/usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In function srtp_aes_gcm_openssl_dealloc': aes_gcm_ossl.c:(.text+0x147): undefined reference toEVP_CIPHER_CTX_free'
/usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In function srtp_aes_gcm_openssl_encrypt': aes_gcm_ossl.c:(.text+0x19e): undefined reference toEVP_Cipher'
/usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In function srtp_aes_gcm_openssl_decrypt': aes_gcm_ossl.c:(.text+0x1e3): undefined reference toEVP_CIPHER_CTX_ctrl'
aes_gcm_ossl.c:(.text+0x1f9): undefined reference to EVP_Cipher' aes_gcm_ossl.c:(.text+0x208): undefined reference toEVP_Cipher'
/usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In function srtp_aes_gcm_openssl_set_iv': aes_gcm_ossl.c:(.text+0x293): undefined reference toEVP_CipherInit_ex'
aes_gcm_ossl.c:(.text+0x2c1): undefined reference to EVP_CIPHER_CTX_ctrl' aes_gcm_ossl.c:(.text+0x2db): undefined reference toEVP_CIPHER_CTX_ctrl'
aes_gcm_ossl.c:(.text+0x2f2): undefined reference to EVP_CIPHER_CTX_ctrl' /usr/local/lib/libsrtp2.a(aes_gcm_ossl.o): In functionsrtp_aes_gcm_openssl_alloc':
aes_gcm_ossl.c:(.text+0x3cb): undefined reference to EVP_CIPHER_CTX_new' /usr/local/lib/libsrtp2.a(hmac_ossl.o): In functionsrtp_hmac_start':
hmac_ossl.c:(.text+0xe): undefined reference to HMAC_Init_ex' /usr/local/lib/libsrtp2.a(hmac_ossl.o): In functionsrtp_hmac_update':
hmac_ossl.c:(.text+0x61): undefined reference to HMAC_Update' /usr/local/lib/libsrtp2.a(hmac_ossl.o): In functionsrtp_hmac_init':
hmac_ossl.c:(.text+0x8e): undefined reference to EVP_sha1' hmac_ossl.c:(.text+0xa2): undefined reference toHMAC_Init_ex'
/usr/local/lib/libsrtp2.a(hmac_ossl.o): In function srtp_hmac_dealloc': hmac_ossl.c:(.text+0xc9): undefined reference toHMAC_CTX_free'
/usr/local/lib/libsrtp2.a(hmac_ossl.o): In function srtp_hmac_compute': hmac_ossl.c:(.text+0x129): undefined reference toHMAC_Update'
hmac_ossl.c:(.text+0x142): undefined reference to HMAC_Final' /usr/local/lib/libsrtp2.a(hmac_ossl.o): In functionsrtp_hmac_alloc':
hmac_ossl.c:(.text+0x21c): undefined reference to `HMAC_CTX_new'
collect2: error: ld returned 1 exit status
examples/CMakeFiles/example7.dir/build.make:96: ошибка выполнения рецепта для цели «examples/example7»
make[2]: *** [examples/example7] Ошибка 1
CMakeFiles/Makefile2:415: ошибка выполнения рецепта для цели «examples/CMakeFiles/example7.dir/all»
make[1]: *** [examples/CMakeFiles/example7.dir/all] Ошибка 2
Makefile:127: ошибка выполнения рецепта для цели «all»
make: *** [all] Ошибка 2

AttributeError: 'module' object has no attribute 'xfeatures2d' [python/opencv 3.1.0 dev]

To resolve this error I tried to add extra module opencv-contrib-master from https://github.com/opencv/opencv_contrib.git I followed the steps given in the readme.md file but while running 'make' I am getting the following output:
[ 4%] Built target libwebp
[ 4%] Built target opencv_core_pch_dephelp
[ 4%] Built target pch_Generate_opencv_core
Scanning dependencies of target opencv_core
[ 4%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/system.cpp.o
Linking CXX shared library ../../lib/libopencv_core.so
[ 7%] Built target opencv_core
[ 7%] Built target opencv_ts_pch_dephelp
[ 7%] Built target pch_Generate_opencv_ts
[ 7%] Built target opencv_imgproc_pch_dephelp
[ 8%] Built target pch_Generate_opencv_imgproc
Linking CXX shared library ../../lib/libopencv_imgproc.so
[ 11%] Built target opencv_imgproc
[ 11%] Built target opencv_imgcodecs_pch_dephelp
[ 11%] Built target pch_Generate_opencv_imgcodecs
Linking CXX shared library ../../lib/libopencv_imgcodecs.so
[ 12%] Built target opencv_imgcodecs
[ 12%] Built target opencv_videoio_pch_dephelp
[ 12%] Built target pch_Generate_opencv_videoio
Linking CXX shared library ../../lib/libopencv_videoio.so
[ 13%] Built target opencv_videoio
[ 13%] Built target opencv_highgui_pch_dephelp
[ 13%] Built target pch_Generate_opencv_highgui
Linking CXX shared library ../../lib/libopencv_highgui.so
[ 14%] Built target opencv_highgui
[ 14%] Built target opencv_ts
[ 14%] Built target opencv_perf_core_pch_dephelp
[ 14%] Built target pch_Generate_opencv_perf_core
Linking CXX executable ../../bin/opencv_perf_core
[ 16%] Built target opencv_perf_core
[ 16%] Built target opencv_test_core_pch_dephelp
[ 16%] Generating test_precomp.hpp.gch/opencv_test_core_RELEASE.gch
In file included from <command-line>:0:0:
/usr/include/stdc-predef.h:1:0: fatal error: can’t create precompiled header /home/chandu/Opencv/opencv/release/modules/core/test_precomp.hpp.gch/opencv_test_core_RELEASE.gch: Permission denied
/* Copyright (C) 1991-2014 Free Software Foundation, Inc.
^
compilation terminated.
Preprocessed source stored into /tmp/cchn5Yvk.out file, please attach this to your bugreport.
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/_usr_lib_gcc_x86_64-linux-gnu_4.9_cc1plus.1000.crash'
make[2]: *** [modules/core/test_precomp.hpp.gch/opencv_test_core_RELEASE.gch] Error 1
make[1]: *** [modules/core/CMakeFiles/pch_Generate_opencv_test_core.dir/all] Error 2
make: *** [all] Error 2
Somewhere it was told that there may be problem in gcc version but I updated gcc version but no success. I am using gcc of version 4.9.4 and ubuntu of version 14.04.1. Before 'make' step I ran:
cmake -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules /usr/local .. -DWITH_IPP=OFF -DWITH_OPENGL=ON -DWITH_QT=ON -DBUILD_EXAMPLES=ON
I approached many resources but no results. Any kind of help is appreciable.

Did you tried prepending the command with sudo?

The problem is that xfeatures2d was not being exported from opencv-contrib module. So, when I was running 'make' command it was not able to add that module to opencv build module.
I ran the following command followed by make command:
export xfeatures2d=/path/to/opencv_contrib/modules/
It worked for me.

No libclang.a after successfull build for iOS?

I've extracted official llvm/clang sources for 3.7 release, did some minor patching (NSGetEnviron()), configured and build for iOS with cmake:
cmake ../llvm_37_ios \
-DCMAKE_INSTALL_PREFIX=/Volumes/Transcend/dev/src/llvm_37_ios_armv7_installed \
-DLLVM_ENABLE_TERMINFO=OFF \
-DLLVM_ENABLE_THREADS=OFF \
-DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk \
-DCMAKE_C_FLAGS="-stdlib=libc++ -arch armv7 -mios-version-min=8.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk" \
-DCMAKE_CXX_FLAGS="-stdlib=libc++ -arch armv7 -mios-version-min=8.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk" \
-DCMAKE_CROSSCOMPILING=True \
-DLLVM_TABLEGEN=/Volumes/Transcend/dev/src/llvm_37_local_build/bin/llvm-tblgen \
-DCLANG_TABLEGEN=/Volumes/Transcend/dev/src/llvm_37_local_build/bin/clang-tblgen \
-DCMAKE_BUILD_TYPE=Release \
-DLLVM_TARGETS_TO_BUILD="ARM;X86"
However i did not find libclang.a but found another libclang*.a libs:
MBA-Anton:llvm_37_ios_armv7_build asmirnov$ find . -name "libclang.a"
MBA-Anton:llvm_37_ios_armv7_build asmirnov$ find . -name "libclang*.a"
./lib/libclangBasic.a
./lib/libclangLex.a
./lib/libclangASTMatchers.a
./lib/libclangParse.a
./lib/libclangDynamicASTMatchers.a
./lib/libclangAnalysis.a
./lib/libclangEdit.a
./lib/libclangRewrite.a
./lib/libclangAST.a
./lib/libclangDriver.a
./lib/libclangCodeGen.a
./lib/libclangSerialization.a
./lib/libclangRewriteFrontend.a
./lib/libclangSema.a
./lib/libclangFrontendTool.a
./lib/libclangARCMigrate.a
./lib/libclangToolingCore.a
./lib/libclangFrontend.a
./lib/libclangIndex.a
./lib/libclangTooling.a
./lib/libclangFormat.a
./lib/libclangStaticAnalyzerFrontend.a
./lib/libclangStaticAnalyzerCore.a
./lib/libclangStaticAnalyzerCheckers.a
For some reason shared library was created but static was not:
Linking CXX executable ../../../../bin/clang
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexDiagnostic.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexHigh.cpp.o
[ 98%] Built target clang
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexInclusionStack.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexUSRs.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexer.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXComment.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXCursor.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXCompilationDatabase.cpp.o
[ 98%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXLoadedDiagnostic.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXSourceLocation.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXStoredDiagnostic.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXString.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXType.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/IndexBody.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/IndexDecl.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/IndexTypeSourceInfo.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/Indexing.cpp.o
[100%] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/IndexingContext.cpp.o
Linking CXX shared library ../../../../lib/libclang.dylib
[100%] Built target libclang
Did i miss something or it's clang configuration bug?

libclang is built as a shared library by default because it simplifies consumption from other languages such as Python using FFI or similar mechanisms.
To build a static library use LIBCLANG_BUILD_STATIC CMake option defined in clang/tools/libclang/CMakeLists.txt:
option(LIBCLANG_BUILD_STATIC
"Build libclang as a static library (in addition to a shared one)" OFF)
You can use it as follows:
cmake -DLIBCLANG_BUILD_STATIC=ON ...

How to install OpenCV on OS X Lion using brew

i'm trying to install opencv libraries using brew.
i tried:
sudo brew install opencv
this is the output:
user$ sudo brew install opencv
sudo: /var/db/sudo writable by non-owner (040777), should be mode 0700
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
/usr/local/Library/Homebrew/global.rb:64: warning: Insecure world writable dir /opt/local in PATH, mode 040777
/usr/local/bin/brew:74: warning: Insecure world writable dir /opt/local in PATH, mode 040777
Warning: It appears you have MacPorts or Fink installed.
Software installed with other package managers causes known problems for
Homebrew. If a formula fails to build, uninstall MacPorts/Fink and try again.
/usr/local/Library/Homebrew/build.rb:7: warning: Insecure world writable dir /opt/local in PATH, mode 040777
==> Downloading http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.3.1/OpenCV-2.3.1a.tar.bz2
File already downloaded in /Library/Caches/Homebrew
==> Patching
patching file modules/highgui/src/grfmt_exr.hpp
==> cmake . -DCMAKE_INSTALL_PREFIX='/usr/local/Cellar/opencv/2.3.1a' -DCMAKE_BUILD_TYPE=None -Wno-dev -DPYTHON_LIBRARY='/System/Library/Frameworks/Python.framework/Versions/2.7/Python' -DP
==> make
Scanning dependencies of target opencv_core
[ 1%] [ 1%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/arithm.o
Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/alloc.o
[ 1%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/array.o
[ 1%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/cmdparser.o
[ 1%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/convert.o
[ 2%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/copy.o
[ 2%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/datastructs.o
[ 2%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/drawing.o
[ 2%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/dxt.o
[ 3%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/lapack.o
[ 3%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/mathfuncs.o
[ 3%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/matmul.o
[ 3%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/matop.o
[ 4%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/matrix.o
[ 4%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/out.o
[ 4%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/persistence.o
[ 4%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/precomp.o
[ 5%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/rand.o
[ 5%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/stat.o
[ 5%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/system.o
[ 5%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/tables.o
Linking CXX shared library ../../lib/libopencv_core.dylib
[ 5%] Built target opencv_core
Scanning dependencies of target opencv_flann
[ 6%] Building CXX object modules/flann/CMakeFiles/opencv_flann.dir/src/flann.o
Scanning dependencies of target opencv_imgproc
[ 6%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/accum.o
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/src/flann.cpp:29:
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/src/precomp.hpp:17:
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/all_indices.h:42:
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/lsh_index.h:89:81: error: no matching constructor for initialization of 'cvflann::LshIndexParams'
LshIndex(const Matrix<ElementType>& input_data, const IndexParams& params = LshIndexParams(),
^
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/lsh_index.h:59:5: note: candidate constructor not viable: requires 3 arguments, but 0 were provided
LshIndexParams(unsigned int table_number, unsigned int key_size, unsigned int multi_probe_level)
^
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/lsh_index.h:57:8: note: candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 0 were provided
struct LshIndexParams : public IndexParams
^
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/src/flann.cpp:29:
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/src/precomp.hpp:10:
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/index_testing.h:39:
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/nn_index.h:39:
In file included from /tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/params.h:33:
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/any.h:88:67: error: call to function 'operator<<' that is neither visible in the template definition nor found by argument-dependent lookup
virtual void print(std::ostream& out, void* const* src) { out << *reinterpret_cast<T const*>(*src); }
^
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/any.h:136:44: note: in instantiation of member function 'cdiggins::anyimpl::big_any_policy<cdiggins::anyimpl::empty_any>::print' requested here
static typename choose_policy<T>::type policy;
^
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/any.h:159:18: note: in instantiation of function template specialization 'cdiggins::anyimpl::get_policy<cdiggins::anyimpl::empty_any>' requested here
: policy(anyimpl::get_policy<anyimpl::empty_any>()), object(NULL)
^
/tmp/homebrew-opencv-2.3.1a-dWXV/OpenCV-2.3.1/modules/flann/include/opencv2/flann/any.h:276:22: note: 'operator<<' should be declared prior to the call site or in namespace 'cdiggins::anyimpl'
inline std::ostream& operator <<(std::ostream& out, const any& any_val)
^
2 errors generated.
make[2]: *** [modules/flann/CMakeFiles/opencv_flann.dir/src/flann.o] Error 1
make[1]: *** [modules/flann/CMakeFiles/opencv_flann.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 7%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/approx.o
[ 7%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/canny.o
[ 7%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/color.o
[ 7%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/contours.o
[ 8%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/convhull.o
[ 8%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/corner.o
[ 8%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/cornersubpix.o
[ 8%] [ 9%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/deriv.o
Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/distransform.o
[ 9%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/emd.o
[ 9%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/featureselect.o
[ 9%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/featuretree.o
[ 10%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/filter.o
[ 10%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/floodfill.o
[ 10%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/geometry.o
[ 10%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/grabcut.o
[ 11%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/histogram.o
[ 11%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/hough.o
[ 11%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/imgwarp.o
[ 11%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/inpaint.o
[ 12%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/kdtree.o
[ 12%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/linefit.o
[ 12%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/lsh.o
[ 12%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/matchcontours.o
[ 12%] [ 13%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/moments.o
Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/morph.o
[ 13%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/precomp.o
[ 13%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/pyramids.o
[ 13%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/pyrsegmentation.o
[ 14%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/rotcalipers.o
[ 14%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/samplers.o
[ 14%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/segmentation.o
[ 14%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/shapedescr.o
[ 15%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/smooth.o
[ 15%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/spilltree.o
[ 15%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/subdivision2d.o
[ 15%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/sumpixels.o
[ 16%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/tables.o
[ 16%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/templmatch.o
[ 16%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/thresh.o
[ 16%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/undistort.o
[ 17%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/utils.o
Linking CXX shared library ../../lib/libopencv_imgproc.dylib
[ 17%] Built target opencv_imgproc
make: *** [all] Error 2
CMakeCache.txt was copied to /Users/turchijacopo/Library/Logs/Homebrew
==> Exit Status: 2
http://github.com/mxcl/homebrew/blob/master/Library/Formula/opencv.rb#L76
==> Environment
HOMEBREW_VERSION: 0.8.1
HEAD: 3b771d09e48f4dfa88ef4c5d32f3b84ca2ae18ec
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
Hardware: dual-core 64-bit penryn
OS X: 10.7.3
Kernel Architecture: x86_64
Xcode: 4.3.1
GCC-4.0: N/A
GCC-4.2: N/A
LLVM: build 2336
Clang: 3.0 build 211
MacPorts or Fink? /opt/local/bin/port
X11: /usr/X11
System Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Which Perl: /usr/bin/perl
Which Python: /usr/bin/python
Which Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
==> Build Flags
CC: /usr/bin/clang
CXX: /usr/bin/clang++ => /usr/bin/clang
LD: /usr/bin/clang
CFLAGS: -Os -w -pipe -march=native -Qunused-arguments
CXXFLAGS: -Os -w -pipe -march=native -Qunused-arguments
MAKEFLAGS: -j2
Error: Failed executing: make
These existing issues may help you:
https://github.com/mxcl/homebrew/issues/10862
Otherwise, please report the bug:
https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
what can i do ?

You can start by reading the error message:
These existing issues may help you:
https://github.com/mxcl/homebrew/issues/10862
That's probably not your problem, but one idea is to try to install OpenCV 32-bits:
brew install opencv --32-bit
And if that doesn't work:
please report the bug:
https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
You can always download OpenCV source code and compile it yourself. It's what I did on Mac OS X.