Consider `target_prefix` in extension Makefiles

1 files changed, 6 insertions, 1 deletions

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index 2a93864e4a..6b93b189c2 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -769,7 +769,12 @@ module RbInstall
           return [] if name.empty?
 
           feature = makefile[/^DLLIB[ \t]*=[ \t]*((?:.*\\\n)*.*)/, 1]
-          Array(feature.sub("$(TARGET)", name))
+          feature = feature.sub("$(TARGET)", name)
+
+          target_prefix = makefile[/^target_prefix[ \t]*=[ \t]*((?:.*\\\n)*.*)/, 1]
+          feature = File.join(target_prefix.delete_prefix("/"), feature) unless target_prefix.empty?
+
+          Array(feature)
         end
 
         def makefile_path