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build: look for Perl in configure.
Bison uses "/usr/bin/perl" or "perl" in several places, and it does not appear to be a problem. But, at least to make it simpler to change PERL on the make command line, check for perl in configure. * configure.ac (PERL): New. * doc/Doxyfile.in, doc/local.mk, examples/local.mk, * tests/bison.in: Use it.
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@@ -22,7 +22,6 @@ TEST_LOG_COMPILER = $(top_srcdir)/examples/test
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doc = $(top_srcdir)/doc/bison.texinfo
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extexi = $(top_srcdir)/examples/extexi
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PERL = perl
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extract = VERSION="$(VERSION)" $(PERL) -f $(extexi) $(doc) --
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extracted =
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CLEANFILES += $(extracted) examples/extracted.stamp
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