For Windows, the WITH_QUICKTIME flag, together with approriate paths
is added to the following msvc6 'release' projectfiles:
bf\blender\projectfiles\blender\imbuf\BL_imbuf.dsp
bf\blender\projectfiles\blender\src\BL_src.dsp
bf\blender\projectfiles\blender\render\BRE_render.dsp
bf\blender\projectfiles\blender\blender.dsp
Erase the flag if you don't want Quicktime support.