kripken/emscripten — pull request #1954 by richq (2013-12-27 09:20:26+00:00)
Title: Fix missing SDL_LockSurface reference

Prior to this change, when blitting from the screen to a memory buffer
the code could throw a "ReferenceError: _SDL_LockSurface is not defined"
if SDL_LockSurface was not used elsewhere in the C code.