GNU gettext utilities: AM_GNU_GETTEXT_NEED
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13.5.3 AM_GNU_GETTEXT_NEED in gettext.m4
The AM_GNU_GETTEXT_NEED macro declares a constraint regarding the GNU gettext implementation. The syntax is
AM_GNU_GETTEXT_NEED([needsymbol])
If needsymbol is ‘need-ngettext’, then GNU gettext implementations (in libc or libintl) without the ngettext() function will be ignored. If needsymbol is ‘need-formatstring-macros’, then GNU gettext implementations that don’t support the ISO C 99 <inttypes.h> formatstring macros will be ignored.
The optional second argument of AM_GNU_GETTEXT is also taken into account.
The AM_GNU_GETTEXT_NEED invocations can occur before or after the AM_GNU_GETTEXT invocation; the order doesn’t matter.