Add info to Compile document for building on Snow Leopard

Compile.rst

@@ -67,6 +67,8 @@ program.
 Mac OS X
 ========
 
+If you are building on 10.6, please read the subsection below titled "Snow Leopard Changes" FIRST.
+
 1. Download and unpack a copy of the latest DF
 2. Install Xcode from Mac App Store
 3. Open Xcode, go to Preferences > Downloads, and install the Command Line Tools.
@@ -106,6 +108,21 @@ Mac OS X
     make
     make install
 
+
+Snow Leopard Changes
+====================
+
+1. Add a step 6.2a (before Install XML::LibXSLT)::
+	In a separate Terminal window or tab, run:
+	sudo ln -s /usr/include/libxml2/libxml /usr/include/libxml
+	
+2. Add a step 7a (before building)::
+	In <dfhack directory>/library/LuaTypes.cpp, change line 467 to 
+		int len = strlen((char*)ptr); 
+
+3. After the whole thing is built and installed, edit the "dfhack" script in the DF directory and remove the line
+	export DYLD_FORCE_FLAT_NAMESPACE=1
+
 =======
 Windows
 =======