cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/ptsname_r.c -o stdlib/ptsname_r -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
stdlib/ptsname_r.c:11:35: error: use of undeclared identifier 'ptsname_r'; did you mean 'ptsname'?
int (*foo)(int, char *, size_t) = ptsname_r;
                                  ^~~~~~~~~
                                  ptsname
/usr/include/stdlib.h:239:7: note: 'ptsname' declared here
char    *ptsname(int);
         ^
stdlib/ptsname_r.c:11:7: error: incompatible function pointer types initializing 'int (*)(int, char *, size_t)' (aka 'int (*)(int, char *, unsigned long)') with an expression of type 'char *(int)' [-Werror,-Wincompatible-function-pointer-types]
int (*foo)(int, char *, size_t) = ptsname_r;
      ^                           ~~~~~~~~~
2 errors generated.