configure: Declare GPERF and PERL as variables
These are documented in --help and will be cached.
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@ -374,7 +374,9 @@ AC_PROG_LEX
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AC_PROG_YACC
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AM_PATH_PYTHON(,,[:])
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AC_PATH_PROG([PERL], [perl], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
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AC_ARG_VAR([PERL], [the Perl interpreter])
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AC_PATH_PROG([GPERF], [gperf], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
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AC_ARG_VAR([GPERF], [the GNU gperf program])
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# because gperf is not needed by end-users we just report it but do not abort on failure
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AC_MSG_CHECKING([gperf version >= 3.0.0])
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