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-rw-r--r--ext/digest/sha1/extconf.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/digest/sha1/extconf.rb b/ext/digest/sha1/extconf.rb
index 4d8ba64c394..d7b8126de52 100644
--- a/ext/digest/sha1/extconf.rb
+++ b/ext/digest/sha1/extconf.rb
@@ -3,7 +3,8 @@
require "mkmf"
-$CFLAGS << " -DHAVE_CONFIG_H -I#{File.dirname(__FILE__)}/.."
+$defs << "-DHAVE_CONFIG_H"
+$INCFLAGS << " -I$(srcdir)/.."
$objs = [ "sha1init.#{$OBJEXT}" ]