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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/Makefile.am, tests/bison.in: Use it.
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@@ -19,7 +19,7 @@
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abs_top_srcdir='@abs_top_srcdir@'
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abs_top_builddir='@abs_top_builddir@'
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: ${PERL=perl}
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: ${PERL='@PERL@'}
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# Use the shipped files, not those installed.
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BISON_PKGDATADIR=$abs_top_srcdir/data
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