evanphx (owner)

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gist: 180633 Download_button fork
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Index: autoconf/config.guess
===================================================================
--- autoconf/config.guess	(revision 80590)
+++ autoconf/config.guess	(working copy)
@@ -1178,7 +1178,19 @@
     *:Darwin:*:*)
 	UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
 	case $UNAME_PROCESSOR in
-	    *86) UNAME_PROCESSOR=i686 ;;
+	    *86)
+      UNAME_PROCESSOR=i686
+
+      # Check if we're actually on x86_64 and overwrite UNAME_PROCESSOR
+      case $UNAME_RELEASE in
+        10.*)
+	      test -n "$CC_FOR_BUILD" || eval $set_cc_for_build
+	      if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E -dM -) | grep __LP64__ >/dev/null
+        then
+          UNAME_PROCESSOR=x86_64
+        fi
+      esac
+      ;;
 	    unknown) UNAME_PROCESSOR=powerpc ;;
 	esac
 	echo ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}