cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/qsort_r.c -o stdlib/qsort_r -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
stdlib/qsort_r.c:5:92: error: 'qsort_r' undeclared here (not in a function); did you mean 'qsort'?
 void (*foo)(void *, size_t, size_t, int (*)(const void *, const void *, void *), void *) = qsort_r;
                                                                                            ^~~~~~~
                                                                                            qsort