clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/SIGRTMIN.c -o signal/SIGRTMIN -D_POSIX_C_SOURCE=202405L  -lm  -lintl
signal/SIGRTMIN.c:3:2: error: "SIGRTMIN is not defined"
#error "SIGRTMIN is not defined"
 ^
1 error generated.