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-rw-r--r--ext/digest/sha1/extconf.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/digest/sha1/extconf.rb b/ext/digest/sha1/extconf.rb
index c249a415ed..4d8ba64c39 100644
--- a/ext/digest/sha1/extconf.rb
+++ b/ext/digest/sha1/extconf.rb
@@ -22,4 +22,6 @@ have_header("inttypes.h")
have_header("unistd.h")
+$preload = %w[digest]
+
create_makefile("digest/sha1")