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-rw-r--r--tool/fake.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/fake.rb b/tool/fake.rb
index 47e3855116..88709b2f23 100644
--- a/tool/fake.rb
+++ b/tool/fake.rb
@@ -48,6 +48,7 @@ prehook = proc do |extmk|
RbConfig.fire_update!("builddir", builddir)
RbConfig.fire_update!("buildlibdir", builddir)
RbConfig.fire_update!("libdir", builddir)
+ RbConfig.fire_update!("prefix", $topdir)
RbConfig.fire_update!("top_srcdir", $top_srcdir ||= top_srcdir)
RbConfig.fire_update!("extout", $extout)
RbConfig.fire_update!("rubyhdrdir", "$(top_srcdir)/include")