GNU gettext utilities: Importing
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Gettext/docs/latest/Importing
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4.1 Importing the gettext declaration
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 (see 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>
