/usr/bin/gapi2_codegen tries to call /usr/lib/gtk-sharp-2.0/gapi_codegen.exe on x86_64. You missed to modify the file generator/gapi2-codegen.in in addidion to parser/*.in, see the attached patch. Version-Release number of selected component (if applicable): gtk-sharp2-gapi-2.10.3-2.fc8
Created attachment 304215 [details] fix the patch in gapi2-codegen.in
Fixed.
gtk-sharp2-2.10.3-3.fc8 has been submitted as an update for Fedora 8
gtk-sharp2-2.10.3-3.fc8 has been pushed to the Fedora 8 stable repository. If problems still persist, please make note of it in this bug report.