Merge pull request #2275 from wilzbach/fix-18603

Fix Issue 18603 - Update minimally required version for macOS
merged-on-behalf-of: Mike Franklin <JinShil@users.noreply.github.com>

dcompiler.dd

@@ -40,7 +40,7 @@ $(H2 $(LNAME2 requirements, Requirements and Downloads))
     $(LI Gnu C compiler (gcc) or LLVM C compiler (clang))
     )
     $(OSX
-    $(LI Mac OS X Lion (10.7) or later)
+    $(LI Mac OS X Mavericks (10.9) or later)
 
     $(LI Xcode)
     )