clang -O2   -Wall -Wextra -Werror=implicit-function-declaration libintl/dgettext_l.c -o libintl/dgettext_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
libintl/dgettext_l.c:19:17: error: implicit declaration of function 'dgettext_l' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        char* output = dgettext_l("os-test", input, locale);
                       ^
libintl/dgettext_l.c:19:17: note: did you mean 'dgettext'?
/usr/include/libintl.h:55:7: note: 'dgettext' declared here
char *dgettext(const char *, const char *) __format_arg(2);
      ^
libintl/dgettext_l.c:19:8: warning: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]
        char* output = dgettext_l("os-test", input, locale);
              ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.