With gettext 0.18.3.1, "make distcheck" fails, because when it tries to build libintl (using --with-included-gettext, as make distcheck does), it finds references to symbols like _GL_INLINE_HEADER_BEGIN in xsize.h, which are not satisfied, as this particular project is not using gnulib. I can't see anything in the gettext documentation that tells me I must use gnulib with gettext, so either the documentation needs updating, or the undefined symbols need to be defined, it would seem.