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A recent gettext release (0.25 via Homebrew) installs the M4 macros in a different location (<prefix>/share/gettext/m4 instead of <prefix>/share/aclocal). According to the commit messages to avoid "bad interactions between autoreconf and autopoint". Since we only depend on gettext for that macro and this move makes it complicated, we can also just integrate the macro from gnulib directly (which gettext 0.18+ relies on anyway).