eclipse: can't change C/C++ build settings (for adding gprof) - c++

Question

I want to analyze a C++ code in eclipse with GPROF.
I added the code that I want to analyze with "new -> Makefile Project with Existing Code" because I got it as open source from the Internet and now I want to profile it. I'm working with gprof and with eclipse for the first time.
My problem is, that when I go to "project -> properties -> C/C++ build -> settings" I don't see anything more than "Binary Parsers" and "Error Parsers". I can't add flags (e.g. -pg) for the Compiler and Linker. It might have something to do with the Makefile Project?!
(Unfortunately I can't add my screenshot because of to less reputation).
How can I use gprof now? Can I add flags to Compiler and Linker somewhere else?
Thank you!
aciams
EDIT:
The Makefile has been created with cmake. So I added -pg to every file that does not begin with "# CMAKE generated file: DO NOT EDIT!".
When I build the project again I find -pg in
# compile CXX with /usr/bin/c++
CXX_FLAGS = -O3 -DNDEBUG -Wall -g -pg
but when I run the program and search for a file named "gmon.out" nothing can be found. Do I have to set -pg to the Linker explicitly?
This is the important part of CMakeLists.txt:
project()
#set ( CMAKE_BUILD_TYPE Debug )
set ( CMAKE_BUILD_TYPE Release )
#set ( CMAKE_CXX_COMPILER "icpc" )
#set ( CMAKE_CXX_COMPILER "g++-4.2" )
add_definitions ( -Wall -g -pg)
if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
if(${CMAKE_CXX_COMPILER} MATCHES "icpc")
set ( OPENMP_FLAG "-openmp" )
set ( OPENMP_LINK "-openmp" )
else()
set ( OPENMP_FLAG "-fopenmp" )
set ( OPENMP_LINK "-lgomp" )
endif(${CMAKE_CXX_COMPILER} MATCHES "icpc")
elseif (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
if(${CMAKE_GENERATOR} MATCHES "Makefile")
find_package ( OpenMP REQUIRED )
set ( OPENMP_FLAG "-fopenmp" )
set ( OPENMP_LINK "-lgomp" )
#set ( APP_TYPE MACOSX_BUNDLE )
else()
set ( OPENMP_FLAG "-fopenmp" )
set ( OPENMP_LINK "" )
endif(${CMAKE_GENERATOR} MATCHES "Makefile")
else()
set ( OPENMP_FLAG "" )
set ( OPENMP_LINK "" )
endif()
set ( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
set ( CMAKE_PREFIX_PATH
${CMAKE_PREFIX_PATH}
/sw
/opt
/opt/local
/Users/$ENV{USER}/Development
./include
./lib
)
include ( ${QT_USE_FILE} )
include_directories (
${CMAKE_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR} )
set ( EXECUTABLE_OUTPUT_PATH build/release )
set_source_files_properties ( test.cpp test2.cpp
PROPERTIES COMPILE_FLAGS ${OPENMP_FLAG}
)
add_executable ( )
target_link_libraries ()
install ( )
Thanks!