Determining if the pthread_create exist failed with the following output: Change Dir: /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/gmake" "cmTC_876e1/fast" /usr/bin/gmake -f CMakeFiles/cmTC_876e1.dir/build.make CMakeFiles/cmTC_876e1.dir/build gmake[1]: Entering directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_876e1.dir/CheckSymbolExists.c.o /usr/bin/x86_64-pc-linux-gnu-gcc -DNDEBUG -O2 -march=native -pipe -o CMakeFiles/cmTC_876e1.dir/CheckSymbolExists.c.o -c /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c Linking C executable cmTC_876e1 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_876e1.dir/link.txt --verbose=1 /usr/bin/x86_64-pc-linux-gnu-gcc -O2 -march=native -pipe -Wl,-O1 -Wl,--as-needed CMakeFiles/cmTC_876e1.dir/CheckSymbolExists.c.o -o cmTC_876e1 -rdynamic CMakeFiles/cmTC_876e1.dir/CheckSymbolExists.c.o: In function `main': CheckSymbolExists.c:(.text.startup+0x6): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status gmake[1]: *** [CMakeFiles/cmTC_876e1.dir/build.make:98: cmTC_876e1] Error 1 gmake[1]: Leaving directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' gmake: *** [Makefile:126: cmTC_876e1/fast] Error 2 File /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/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: /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/gmake" "cmTC_12c0a/fast" /usr/bin/gmake -f CMakeFiles/cmTC_12c0a.dir/build.make CMakeFiles/cmTC_12c0a.dir/build gmake[1]: Entering directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_12c0a.dir/CheckFunctionExists.c.o /usr/bin/x86_64-pc-linux-gnu-gcc -DNDEBUG -O2 -march=native -pipe -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_12c0a.dir/CheckFunctionExists.c.o -c /usr/share/cmake/Modules/CheckFunctionExists.c Linking C executable cmTC_12c0a /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_12c0a.dir/link.txt --verbose=1 /usr/bin/x86_64-pc-linux-gnu-gcc -O2 -march=native -pipe -DCHECK_FUNCTION_EXISTS=pthread_create -Wl,-O1 -Wl,--as-needed CMakeFiles/cmTC_12c0a.dir/CheckFunctionExists.c.o -o cmTC_12c0a -rdynamic -lpthreads /usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status gmake[1]: *** [CMakeFiles/cmTC_12c0a.dir/build.make:98: cmTC_12c0a] Error 1 gmake[1]: Leaving directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' gmake: *** [Makefile:126: cmTC_12c0a/fast] Error 2 Determining if the pipe2 exist failed with the following output: Change Dir: /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/gmake" "cmTC_cb6d0/fast" /usr/bin/gmake -f CMakeFiles/cmTC_cb6d0.dir/build.make CMakeFiles/cmTC_cb6d0.dir/build gmake[1]: Entering directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_cb6d0.dir/CheckSymbolExists.c.o /usr/bin/x86_64-pc-linux-gnu-gcc -D_LARGEFILE64_SOURCE -D_POSIX_C_SOURCE=200809L -DNDEBUG -std=c99 -O2 -march=native -pipe -o CMakeFiles/cmTC_cb6d0.dir/CheckSymbolExists.c.o -c /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main': /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: error: 'pipe2' undeclared (first use in this function) return ((int*)(&pipe2))[argc]; ^ /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: note: each undeclared identifier is reported only once for each function it appears in gmake[1]: *** [CMakeFiles/cmTC_cb6d0.dir/build.make:66: CMakeFiles/cmTC_cb6d0.dir/CheckSymbolExists.c.o] Error 1 gmake[1]: Leaving directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' gmake: *** [Makefile:126: cmTC_cb6d0/fast] Error 2 File /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp/CheckSymbolExists.c: /* */ #include int main(int argc, char** argv) { (void)argv; #ifndef pipe2 return ((int*)(&pipe2))[argc]; #else (void)argc; return 0; #endif } Determining if the function iw_sockets_open exists failed with the following output: Change Dir: /var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/gmake" "cmTC_de50d/fast" /usr/bin/gmake -f CMakeFiles/cmTC_de50d.dir/build.make CMakeFiles/cmTC_de50d.dir/build gmake[1]: Entering directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_de50d.dir/CheckFunctionExists.c.o /usr/bin/x86_64-pc-linux-gnu-gcc -D_GNU_SOURCE -DNDEBUG -std=c99 -O2 -march=native -pipe -DCHECK_FUNCTION_EXISTS=iw_sockets_open -o CMakeFiles/cmTC_de50d.dir/CheckFunctionExists.c.o -c /usr/share/cmake/Modules/CheckFunctionExists.c Linking C executable cmTC_de50d /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_de50d.dir/link.txt --verbose=1 /usr/bin/x86_64-pc-linux-gnu-gcc -std=c99 -O2 -march=native -pipe -DCHECK_FUNCTION_EXISTS=iw_sockets_open -Wl,-O1 -Wl,--as-needed CMakeFiles/cmTC_de50d.dir/CheckFunctionExists.c.o -o cmTC_de50d -rdynamic CMakeFiles/cmTC_de50d.dir/CheckFunctionExists.c.o: In function `main': CheckFunctionExists.c:(.text.startup+0xe): undefined reference to `iw_sockets_open' collect2: error: ld returned 1 exit status gmake[1]: *** [CMakeFiles/cmTC_de50d.dir/build.make:98: cmTC_de50d] Error 1 gmake[1]: Leaving directory '/var/tmp/portage/app-admin/conky-1.10.4/work/conky-1.10.4_build/CMakeFiles/CMakeTmp' gmake: *** [Makefile:126: cmTC_de50d/fast] Error 2