Determining if the pthread_create exist failed with the following output: Change Dir: /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/gmake" "cmTC_8a54f/fast" gmake[1]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' /usr/bin/gmake -f CMakeFiles/cmTC_8a54f.dir/build.make CMakeFiles/cmTC_8a54f.dir/build gmake[2]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_8a54f.dir/CheckSymbolExists.c.o /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/mips64el-ctng_n32-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DNDEBUG -o CMakeFiles/cmTC_8a54f.dir/CheckSymbolExists.c.o -c /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp/CheckSymbolExists.c Linking C executable cmTC_8a54f /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8a54f.dir/link.txt --verbose=1 /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/mips64el-ctng_n32-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DNDEBUG -rdynamic CMakeFiles/cmTC_8a54f.dir/CheckSymbolExists.c.o -o cmTC_8a54f CMakeFiles/cmTC_8a54f.dir/CheckSymbolExists.c.o: In function `main': CheckSymbolExists.c:(.text.startup+0x8): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status gmake[2]: *** [cmTC_8a54f] Error 1 gmake[2]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' gmake[1]: *** [cmTC_8a54f/fast] Error 2 gmake[1]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' File /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp/CheckSymbolExists.c: /* */ #include int main(int argc, char** argv) { (void)argv; #ifndef pthread_create return ((int*)(&pthread_create))[argc]; #else (void)argc; return 0; #endif } Determining if the function pthread_create exists in the pthreads failed with the following output: Change Dir: /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/gmake" "cmTC_3b8ab/fast" gmake[1]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' /usr/bin/gmake -f CMakeFiles/cmTC_3b8ab.dir/build.make CMakeFiles/cmTC_3b8ab.dir/build gmake[2]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_3b8ab.dir/CheckFunctionExists.c.o /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/mips64el-ctng_n32-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG -o CMakeFiles/cmTC_3b8ab.dir/CheckFunctionExists.c.o -c /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c Linking C executable cmTC_3b8ab /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_3b8ab.dir/link.txt --verbose=1 /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/mips64el-ctng_n32-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG -rdynamic CMakeFiles/cmTC_3b8ab.dir/CheckFunctionExists.c.o -o cmTC_3b8ab -lpthreads /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/mips64el-ctng_n32-linux-gnu/4.8.2/../../../../mips64el-ctng_n32-linux-gnu/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status gmake[2]: *** [cmTC_3b8ab] Error 1 gmake[2]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp' gmake[1]: *** [cmTC_3b8ab/fast] Error 2 gmake[1]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.8/Release/CMakeFiles/CMakeTmp'