clang -O2   -Wall -Wextra -Werror=implicit-function-declaration libintl/dcngettext_l.c -o libintl/dcngettext_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
libintl/dcngettext_l.c:20:18: error: implicit declaration of function 'dcngettext_l' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        char* output0 = dcngettext_l("os-test", input, input_plural, 0, LC_NUMERIC,
                        ^
libintl/dcngettext_l.c:20:18: note: did you mean 'dcngettext'?
/usr/include/libintl.h:61:7: note: 'dcngettext' declared here
char *dcngettext(const char *, const char *, const char *, unsigned long int,
      ^
libintl/dcngettext_l.c:20:8: warning: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]
        char* output0 = dcngettext_l("os-test", input, input_plural, 0, LC_NUMERIC,
              ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libintl/dcngettext_l.c:30:8: warning: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]
        char* output1 = dcngettext_l("os-test", input, input_plural, 1, LC_NUMERIC,
              ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libintl/dcngettext_l.c:39:8: warning: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]
        char* output2 = dcngettext_l("os-test", input, input_plural, 2, LC_NUMERIC,
              ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libintl/dcngettext_l.c:48:8: warning: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]
        char* output9 = dcngettext_l("os-test", input, input_plural, 9, LC_NUMERIC,
              ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 warnings and 1 error generated.