Updated build instructions.

README.md

@@ -3,7 +3,48 @@ Metamod:Source
 
 Metamod:Source - A C++ Plugin Environment and Detour Library for the Source Engine.
 
-Build instructions: See <https://wiki.alliedmods.net/Building_SourceMod>
+Build instructions
+------------------
+
+Make sure ambuild2 is installed: https://github.com/alliedmodders/ambuild
+
+Clone the repo with submodules:
+```
+git clone --recurse-submodules https://github.com/alliedmodders/metamod-source
+```
+
+Clone the SDK dependencies:
+```
+cd ..
+metamod-source/support/checkout-deps.sh
+cd metamod-source
+```
+
+Configure the build:
+```
+mkdir build
+cd build
+python ../configure.py
+```
+
+Build:
+```
+ambuild
+```
+
+You can clone an individual SDK e.g.:
+```
+cd ..
+metamod-source/support/checkout-deps.sh -s episode1
+cd metamod-source
+```
+
+You can configure the build for an individual SDK e.g.:
+```
+mkdir build
+cd build
+python ../configure.py --sdks episode1
+```
 
 Stable build snapshots: <http://www.metamodsource.net/downloads.php/?branch=stable>