cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/psiginfo.c -o signal/psiginfo -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
signal/psiginfo.c:5:48: error: use of undeclared identifier 'psiginfo'; did you mean 'psignal'?
void (*foo)(const siginfo_t *, const char *) = psiginfo;
                                               ^~~~~~~~
                                               psignal
/usr/include/signal.h:135:6: note: 'psignal' declared here
void    psignal(unsigned int, const char *);
        ^
signal/psiginfo.c:5:8: error: incompatible function pointer types initializing 'void (*)(const siginfo_t *, const char *)' with an expression of type 'void (unsigned int, const char *)' [-Werror,-Wincompatible-function-pointer-types]
void (*foo)(const siginfo_t *, const char *) = psiginfo;
       ^                                       ~~~~~~~~
2 errors generated.