Change to build correctly on Lion. Also, build Python by default.

CMakeLists.txt

@@ -110,7 +110,6 @@ ENDIF( CMAKE_SIZEOF_VOID_P EQUAL 8 )
 IF (APPLE AND NOT CMAKE_OSX_DEPLOYMENT_TARGET)
     SET (CMAKE_OSX_ARCHITECTURES "i386;x86_64" CACHE STRING "The processor architectures to build for" FORCE)
     SET (CMAKE_OSX_DEPLOYMENT_TARGET "10.5" CACHE STRING "The minimum version of OS X to support" FORCE)
-    SET (CMAKE_OSX_SYSROOT "/Developer/SDKs/MacOSX10.5.sdk" CACHE STRING "The SDK to build against" FORCE)
 ENDIF (APPLE AND NOT CMAKE_OSX_DEPLOYMENT_TARGET)
 
 IF(UNIX AND NOT CMAKE_BUILD_TYPE)
@@ -448,7 +447,7 @@ ENDIF (OPENMM_BUILD_SERIALIZATION_SUPPORT)
 
 # Python wrappers
 
-SET(OPENMM_BUILD_PYTHON_WRAPPERS OFF CACHE BOOL "Build wrappers for Python")
+SET(OPENMM_BUILD_PYTHON_WRAPPERS ON CACHE BOOL "Build wrappers for Python")
 IF(OPENMM_BUILD_PYTHON_WRAPPERS)
     IF(NOT OPENMM_BUILD_SERIALIZATION_SUPPORT)
         MESSAGE(SEND_ERROR "The Python wrappers require that serialization support be built.")