1 files changed, 19 insertions, 0 deletions
diff --git a/ext/digest/digest_conf.rb b/ext/digest/digest_conf.rb
new file mode 100644
index 0000000000..099d20fcbe
--- /dev/null
+++ b/ext/digest/digest_conf.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: false
+
+def digest_conf(name)
+  unless with_config("bundled-#{name}")
+    case cc = with_config("common-digest", true)
+    when true, false
+    else
+      cc = cc.split(/[\s,]++/).any? {|pat| File.fnmatch?(pat, name)}
+    end
+    if cc and File.exist?("#$srcdir/#{name}cc.h") and
+      have_header("CommonCrypto/CommonDigest.h")
+      $defs << "-D#{name.upcase}_USE_COMMONDIGEST"
+      $headers << "#{name}cc.h"
+      return :commondigest
+    end
+  end
+  $objs << "#{name}.#{$OBJEXT}"
+  return
+end