WSPBuilder: Ensure that GAC’d assemblies are always added to wsp

GAC’d assemblies are not always included in a wsp build by wspbuilder. See

To counteract this, add the following post build events

ATTRIB -R “$(SolutionDir)[FolderContainingFeatureProject]\GAC\” /S /D
COPY “$(TargetPath)” “$(SolutionDir) [FolderContainingFeatureProject] \GAC\” /Y