clang -O2  -Wall -Wextra -Werror=implicit-function-declaration signal/sigwaitinfo.c -o signal/sigwaitinfo -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
../out/minix/basic/signal/sigwaitinfo.o: In function `main':
signal/sigwaitinfo.c:(.text+0x36c): undefined reference to `sigqueue'
signal/sigwaitinfo.c:(.text+0x384): undefined reference to `sigwaitinfo'
signal/sigwaitinfo.c:(.text+0x3fb): undefined reference to `sigwaitinfo'
clang: error: linker command failed with exit code 1 (use -v to see invocation)