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-rw-r--r--ext/extmk.rb5
1 files changed, 4 insertions, 1 deletions
diff --git a/ext/extmk.rb b/ext/extmk.rb
index b0bc9f3c4f..dbc1c92e57 100644
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -382,7 +382,10 @@ end
if $extout
RbConfig.expand(extout = "#$extout", RbConfig::CONFIG.merge("topdir"=>$topdir))
if $install
- RbConfig.expand(dest = "#{$destdir}#{$rubylibdir}")
+ dest = RbConfig.expand($rubylibdir.dup)
+ unless $destdir.empty?
+ dest.sub!($dest_prefix_pattern, RbConfig.expand($destdir.dup))
+ end
FileUtils.cp_r(extout+"/.", dest, :remove_destination => true, :verbose => true, :noop => $dryrun)
exit
end