perl.m4: Fix PERL_LIBDIR for prefix != default

Replace the default prefix (vendorprefixexp) with $(prefix)
in vendorlibexp.

Detected by distcheck

diff --git a/m4/perl.m4 b/m4/perl.m4
index 360cda323c7d6f23f4317f00fb7f36edb9dad1c0..79288d5cb1cde1855de790f80af0cdb1f13c9820 100644 (file)
--- a/m4/perl.m4
+++ b/m4/perl.m4
@@ -5,5 +5,5 @@ AC_DEFUN([DPKG_PROG_PERL],
 [AC_ARG_VAR([PERL], [Perl interpreter])dnl
 AC_PATH_PROG([PERL], [perl], [/usr/bin/perl])dnl
 AC_ARG_VAR([PERL_LIBDIR], [Perl library directory])dnl
-PERL_LIBDIR=`$PERL -MConfig -e 'print $Config{vendorlib}'`dnl
+PERL_LIBDIR=`$PERL -MConfig -e 'my $r=$Config{vendorlibexp};$r=~s/$Config{vendorprefixexp}/\\$(prefix)/; print $r'`dnl
 ])# DPKG_PROG_PERL