Update INSTALL.md

OSX Instructions added.

1 files changed, 18 insertions, 1 deletions

diff --git a/INSTALL.md b/INSTALL.md
index b4e28379..97bef179 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -27,6 +27,23 @@ For example, to build [`Messenger_test.c`](/others/Messenger_test.c) you would r
 make Messenger_test
 ```
 
+###OSX:
+
+Much the same as above, remember to install the latest XCode and the developer tools (Preferences -> Downloads -> Command Line Tools).
+Users running Mountain Lion and the latest version of XCode (4.6.3) will also need to install libtool
+Libtool is easy enough to install, grab it from http://www.gnu.org/software/libtool/ and:
+
+./configure
+make
+sudo make install
+
+Do not install it from macports (or any dependencies for that matter) as they get shoved in the wrong directory
+and make your life more annoying.
+
+Another thing you may want to install is the latest gcc, this caused me a few problems as XCode from 4.3
+no longer includes gcc and instead uses LLVM-GCC, a nice install guide can be found at
+http://caiustheory.com/install-gcc-421-apple-build-56663-with-xcode-42
+
 ###Windows:
 
 You should install:
@@ -49,4 +66,4 @@ mingw32-make name_of_c_file
 For example, to build [`Messenger_test.c`](/others/Messenger_test.c) you would run:
 ```cmd
 mingw32-make Messenger_test
-```
\ No newline at end of file
+```