file ./include/mediaobj.h (not in CVS, is this file generated somehow by ./configure ?? ) Please comment out line 64: DEFINE_GUID(IID_IEnumDMO, 0x2c3cd98a, 0x2bfa, 0x4a53, 0x9c,0x27, 0x52,0x49,0xba,0x64,0xba,0x0f); IID_IEnumDMO is defined as static const in ./dlls/msdmo/dmoreg.c line 94. tom