Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_ddc8a/fast && make[1]: Entering directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_ddc8a.dir/build.make CMakeFiles/cmTC_ddc8a.dir/build make[2]: Entering directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_ddc8a.dir/src.c.o /tmp/instance-1/output-1/host/bin/aarch64-linux-gnu-gcc --sysroot=/tmp/instance-1/output-1/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG -o CMakeFiles/cmTC_ddc8a.dir/src.c.o -c /tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_ddc8a /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_ddc8a.dir/link.txt --verbose=1 /tmp/instance-1/output-1/host/bin/aarch64-linux-gnu-gcc --sysroot=/tmp/instance-1/output-1/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG CMakeFiles/cmTC_ddc8a.dir/src.c.o -o cmTC_ddc8a CMakeFiles/cmTC_ddc8a.dir/src.c.o: In function `main': src.c:(.text.startup+0x28): undefined reference to `pthread_create' src.c:(.text.startup+0x30): undefined reference to `pthread_detach' src.c:(.text.startup+0x3c): undefined reference to `pthread_join' src.c:(.text.startup+0x4c): undefined reference to `pthread_atfork' collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_ddc8a.dir/build.make:87: cmTC_ddc8a] Error 1 make[2]: Leaving directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_ddc8a/fast] Error 2 make[1]: Leaving directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' Source file was: #include void* test_func(void* data) { return data; } int main(void) { pthread_t thread; pthread_create(&thread, NULL, test_func, NULL); pthread_detach(thread); pthread_join(thread, NULL); pthread_atfork(NULL, NULL, NULL); pthread_exit(NULL); return 0; } Determining if the function pthread_create exists in the pthreads failed with the following output: Change Dir: /tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_22fe9/fast && make[1]: Entering directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_22fe9.dir/build.make CMakeFiles/cmTC_22fe9.dir/build make[2]: Entering directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_22fe9.dir/CheckFunctionExists.c.o /tmp/instance-1/output-1/host/bin/aarch64-linux-gnu-gcc --sysroot=/tmp/instance-1/output-1/host/aarch64-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_22fe9.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.16/Modules/CheckFunctionExists.c Linking C executable cmTC_22fe9 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_22fe9.dir/link.txt --verbose=1 /tmp/instance-1/output-1/host/bin/aarch64-linux-gnu-gcc --sysroot=/tmp/instance-1/output-1/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG CMakeFiles/cmTC_22fe9.dir/CheckFunctionExists.c.o -o cmTC_22fe9 -lpthreads /tmp/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/7.3.1/../../../../aarch64-linux-gnu/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_22fe9.dir/build.make:87: cmTC_22fe9] Error 1 make[2]: Leaving directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_22fe9/fast] Error 2 make[1]: Leaving directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' Determining if the include file filesystem exists failed with the following output: Change Dir: /tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_96b1a/fast && make[1]: Entering directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_96b1a.dir/build.make CMakeFiles/cmTC_96b1a.dir/build make[2]: Entering directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' Building CXX object CMakeFiles/cmTC_96b1a.dir/CheckIncludeFile.cxx.o /tmp/instance-1/output-1/host/bin/aarch64-linux-gnu-g++ --sysroot=/tmp/instance-1/output-1/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -latomic -Wall -DNDEBUG -std=c++1z -o CMakeFiles/cmTC_96b1a.dir/CheckIncludeFile.cxx.o -c /tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx /tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx:1:10: fatal error: filesystem: No such file or directory #include ^~~~~~~~~~~~ compilation terminated. make[2]: *** [CMakeFiles/cmTC_96b1a.dir/build.make:66: CMakeFiles/cmTC_96b1a.dir/CheckIncludeFile.cxx.o] Error 1 make[2]: Leaving directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_96b1a/fast] Error 2 make[1]: Leaving directory '/tmp/instance-1/output-1/build/gerbera-1.6.4/CMakeFiles/CMakeTmp'