cc -O2 -pthread -I/usr/local/include  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations langinfo/locale_t.c -o langinfo/locale_t -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt -L/usr/local/lib  -lintl -lcrypt
langinfo/locale_t.c:2:1: error: unknown type name 'locale_t'
    2 | locale_t* foo;
      | ^~~~~~~~