Add AMBuild support

configure.py

@@ -0,0 +1,33 @@
+# vim: set ts=2 sw=2 tw=99 noet:
+import sys
+try:
+	from ambuild2 import run
+except:
+	try:
+		import ambuild
+		sys.stderr.write('It looks like you have AMBuild 1 installed, but this project uses AMBuild 2.\n')
+		sys.stderr.write('Upgrade to the latest version of AMBuild to continue.\n')
+	except:
+		sys.stderr.write('AMBuild must be installed to build this project.\n')
+		sys.stderr.write('http://www.alliedmods.net/ambuild\n')
+	sys.exit(1)
+
+run = run.PrepareBuild(sourcePath=sys.path[0])
+run.default_build_folder = 'obj-' + run.target_platform
+run.options.add_option('--hl2sdk-root', type=str, dest='hl2sdk_root', default=None,
+		                   help='Root search folder for HL2SDKs')
+run.options.add_option('--mms-path', type=str, dest='mms_path', default=None,
+                       help='Path to Metamod:Source')
+run.options.add_option('--sm-path', type=str, dest='sm_path', default=None,
+                       help='Path to Sourcemod')
+run.options.add_option('--steamworks-path', type=str, dest='steamworks_path', default=None,
+                       help='Path to SteamWorks')
+run.options.add_option('--enable-debug', action='store_const', const='1', dest='debug',
+                       help='Enable debugging symbols')
+run.options.add_option('--enable-optimize', action='store_const', const='1', dest='opt',
+                       help='Enable optimization')
+run.options.add_option('-s', '--sdks', default='all', dest='sdks',
+                       help='Build against specified SDKs; valid args are "all", "present", or '
+                            'comma-delimited list of engine names (default: %default)')
+
+run.Configure()