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-rw-r--r--lib/mkmf.rb3
1 files changed, 1 insertions, 2 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index e518a7efe1..65ae853bac 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -79,8 +79,7 @@ end
libdir = File.dirname(__FILE__)
$extmk = libdir != Config::CONFIG["rubylibdir"]
if not $extmk and File.exist? Config::CONFIG["archdir"] + "/ruby.h"
- $topdir = Config::CONFIG["archdir"]
- $hdrdir = $archdir
+ $hdrdir = $topdir = Config::CONFIG["archdir"]
elsif File.exist? $srcdir + "/ruby.h"
$topdir = Config::CONFIG["compile_dir"]
$hdrdir = $srcdir