Build using cmake a g++ command with -I,-L and -l - build

Question

This is the program I want to run, main.cpp:
#include <iostream>
#include "yaracpp/yaracpp.h"
int main() {
yaracpp::YaraDetector yara;
yara.addRules(R"(
rule example {
strings:
$s = "Hello"
condition:
$s
})");
if (yara.analyze("test_file")) {
for (const auto& rule : yara.getDetectedRules()) {
std::cout << rule << '\n';
}
}
}
When I run this command on the terminal it compiles successfully:
g++ -Iinclude -Ibuild/deps/yara/src/yara/libyara/include/ -Lbuild/src/ -Lbuild/deps/yara/src/yara/libyara/.libs/ main.cpp -lyaracpp -lyara -lpthread -lssl -lcrypto
My CMakeLists.txt is:
cmake_minimum_required(VERSION 3.6)
project(main CXX C)
add_executable(main main.cpp)
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Iinclude -Ibuild/deps/yara/src/yara/libyara/include -Lbuild/src -Lbuild/deps/yara/src/yara/libyara/.libs/")
target_link_libraries (main yaracpp yara pthread ssl crypto)
This happens when I try to build it:
cmake .
-- The CXX compiler identification is GNU 7.4.0
-- The C compiler identification is GNU 7.4.0
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/mevasu/yaracpp
make
[ 50%] Building CXX object CMakeFiles/main.dir/main.cpp.o
/home/mevasu/yaracpp/main.cpp:2:10: fatal error: yaracpp/yaracpp.h: No such file or directory
#include "yaracpp/yaracpp.h"
^~~~~~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/main.dir/build.make:62: recipe for target 'CMakeFiles/main.dir/main.cpp.o' failed
make[2]: *** [CMakeFiles/main.dir/main.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/main.dir/all' failed
make[1]: *** [CMakeFiles/main.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Answer 1

Looking at the output, there is the following line:
c++: error: yaracpp/main.cpp: No such file or directory
Does the file exist? Looking at your CMakeLists.txt, the file appears in the following command:
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} [..] yaracpp/main.cpp ")
^^^^^^^^^^^^^^^^
Why do you add yaracpp/main.cpp into CMAKE_CXX_FLAGS when it (apparently) has already been added in the following line?
add_executable(main main.cpp)
^^^^^^^^
I highly suggest learning the basics of CMake before continuing in your endeavors.