This file (extfuncs.lst) is automatically read if extfuncs.py is run without
parameters. The file is simply scanned for patterns that look like OpenGL
function calls, everything else is ignored. You may put a simple list of used
functions here, or, as I did in this example, the linker messages that complain
about the missing functions:

wglSwapIntervalEXT

glCreateShader
glShaderSource
glCompileShader
glCreateProgram
glAttachShader
glLinkProgram
glUseProgram
glGetShaderiv
glGetProgramiv
glGetShaderInfoLog
glGetProgramInfoLog
glGetUniformLocation
glGetAttribLocation
glUniform1f