gettext: Importing
4.1 Importing the ‘gettext’ declaration
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Presuming that your set of programs, or package, has been adjusted so
all needed GNU ‘gettext’ files are available, and your ‘Makefile’ files
are adjusted (⇒Maintainers), each C module having translated C
strings should contain the line:
#include <libintl.h>
Similarly, each C module containing ‘printf()’/‘fprintf()’/... calls
with a format string that could be a translated C string (even if the C
string comes from a different C module) should contain the line:
#include <libintl.h>