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