clang -O2   -Wall -Wextra -Werror=implicit-function-declaration libintl/gettext_l.c -o libintl/gettext_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
libintl/gettext_l.c:19:17: error: implicit declaration of function 'gettext_l' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        char* output = gettext_l(input, locale);
                       ^
libintl/gettext_l.c:19:17: note: did you mean 'gettext'?
/usr/include/libintl.h:54:7: note: 'gettext' declared here
char *gettext(const char *) __format_arg(1);
      ^
libintl/gettext_l.c:19:8: warning: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]
        char* output = gettext_l(input, locale);
              ^        ~~~~~~~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.