clang -O2  -Wall -Wextra -Werror=implicit-function-declaration monetary/strfmon_l.c -o monetary/strfmon_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
monetary/strfmon_l.c:25:7: error: implicit declaration of function 'strfmon_l' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        if ( strfmon_l(output, sizeof(output), locale,
             ^
monetary/strfmon_l.c:25:7: note: did you mean 'strfmon'?
/usr/include/monetary.h:48:9: note: 'strfmon' declared here
ssize_t strfmon(char * __restrict, size_t, const char * __restrict, ...)
        ^
1 error generated.