cc -O2 -pthread  -Wall -Wextra -Werror=implicit-function-declaration strings/strcasecmp_l.c -o strings/strcasecmp_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lintl -lcrypt
strings/strcasecmp_l.c: In function 'main':
strings/strcasecmp_l.c:13:7: error: implicit declaration of function 'strcasecmp_l'; did you mean 'strcasecmp'? [-Werror=implicit-function-declaration]
   13 |  if ( strcasecmp_l("foo", "FOO", locale) != 0 )
      |       ^~~~~~~~~~~~
      |       strcasecmp
cc1: some warnings being treated as errors