cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/psiginfo.c -o signal/psiginfo -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
signal/psiginfo.c:5:48: error: use of undeclared identifier 'psiginfo'
void (*foo)(const siginfo_t *, const char *) = psiginfo;
                                               ^
1 error generated.