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-rw-r--r--lib/mkmf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 48e76ed15e..a33bb4c933 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -229,7 +229,7 @@ module MakeMakefile
$hdrdir = CONFIG["rubyhdrdir"]
$topdir = $hdrdir
$top_srcdir = $hdrdir
- $arch_hdrdir = "$(hdrdir)/$(arch)"
+ $arch_hdrdir = CONFIG["rubyarchhdrdir"]
elsif File.exist?(($hdrdir = ($top_srcdir ||= topdir) + "/include") + "/ruby.h")
$topdir ||= RbConfig::CONFIG["topdir"]
$arch_hdrdir = "$(extout)/include/$(arch)"