cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/psignal.c -o signal/psignal -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
signal/psignal.c:5:34: error: use of undeclared identifier 'psignal'; did you mean 'signal'?
void (*foo)(int, const char *) = psignal;
                                 ^~~~~~~
                                 signal
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/signal.h:390:11: note: 'signal' declared here
    void(*signal(int, void (*)(int)))(int);
          ^
signal/psignal.c:5:8: error: incompatible function pointer types initializing 'void (*)(int, const char *)' with an expression of type 'void (*(int, void (*)(int)))(int)' [-Werror,-Wincompatible-function-pointer-types]
void (*foo)(int, const char *) = psignal;
       ^                         ~~~~~~~
2 errors generated.