cc -O2 -pipe -pthread -I/usr/local/include -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 -lpthread -lrt -L/usr/local/lib -lintl -lstdthreads -lcrypt libintl/dgettext_l.c:19:17: error: call to undeclared function 'dgettext_l'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] 19 | char* output = dgettext_l("os-test", input, locale); | ^ libintl/dgettext_l.c:19:17: note: did you mean 'dgettext'? /usr/local/include/libintl.h:240:14: note: 'dgettext' declared here 240 | extern char *dgettext (const char *__domainname, const char *__msgid) | ^ libintl/dgettext_l.c:19:8: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion] 19 | char* output = dgettext_l("os-test", input, locale); | ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2 errors generated.