clang -O2 -Wall -Wextra -Werror=implicit-function-declaration math/llrintl.c -o math/llrintl -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lintl math/llrintl.c:10:14: warning: pragma STDC FENV_ACCESS ON is not supported, ignoring pragma [-Wunknown-pragmas] #pragma STDC FENV_ACCESS ON ^ 1 warning generated. ../out/minix/basic/math/llrintl.o: In function `test': math/llrintl.c:(.text+0x329): undefined reference to `llrintl' clang: error: linker command failed with exit code 1 (use -v to see invocation)