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maint: catch missing gnulib macros.
* configure.ac: Add m4_pattern_forbid.
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@@ -20,7 +20,8 @@
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# keyword in at least string.h from gnulib. We need Autoconf 2.68 or
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# better to avoid a typo in the `configure --help' entry for the YACC
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# environment variable.
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AC_PREREQ(2.68)
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AC_PREREQ([2.68])
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m4_pattern_forbid([^gl_[A-Z]])
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AC_INIT([GNU Bison],
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m4_esyscmd([build-aux/git-version-gen .tarball-version]),
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