Added an hack to support virtualenv installation targets
Added an hack to support virtualenv installation targets

svn path=/trunk/libavg/; revision=7065

scotty007/libavg,yyd01245/libavg,scotty007/libavg,scotty007/libavg,libavg/libavg,libavg/libavg,yyd01245/libavg,th3infinity/libavg,yyd01245/libavg,th3infinity/libavg,hoodie/libavg,hoodie/libavg,scotty007/libavg,hoodie/libavg,libavg/libavg,hoodie/libavg,libavg/libavg,th3infinity/libavg,yyd01245/libavg,th3infinity/libavg