cc -O2 -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations strings/strcasecmp_l.c -o strings/strcasecmp_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lintl -lcrypt
strings/strcasecmp_l.c:5:40: error: unknown type name 'locale_t'
    5 | int (*foo)(const char *, const char *, locale_t) = strcasecmp_l;
      |                                        ^~~~~~~~