Hi!

First of all thanks for the new release! I noticed that the default location for scalable images is

${TRACKBALLS_ICON}/icons/hicolor/scalable/apps/

However $TRACKBALLS_ICON is defined as /usr/share/icons/hicolor by default. While this works fine for the normal images, the scalable icon will be installed into /usr/share/icons/hicolor/icons/hicolor/scalable/apps which is the wrong directory. I suggest to change the above line to

${TRACKBALLS_ICON}/scalable/apps/

which is the correct default location for scalable images.