Configure: suppress $multilib with non-system $prefix.
PR: 2307
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@ -1098,6 +1098,12 @@ my $ar = $ENV{'AR'} || "ar";
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my $arflags = $fields[$idx_arflags];
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my $multilib = $fields[$idx_multilib];
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# if $prefix/lib$multilib is not an existing directory, then
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# assume that it's not searched by linker automatically, in
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# which case adding $multilib suffix causes more grief than
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# we're ready to tolerate, so don't...
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$multilib="" if !-d "$prefix/lib$multilib";
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$libdir="lib$multilib" if $libdir eq "";
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$cflags = "$cflags$exp_cflags";
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