itcl and vtk install not reliable

[timj]

itcl can not be installed into a tree where itcl is already installed because it fails to deal with the directories that are already present:

mkdir /var/folders/ll/34nyr16s1w5_3m896tr29cvr0000gn/T/starconf-565/star/lib/iwidgets4.0.1
mkdir /var/folders/ll/34nyr16s1w5_3m896tr29cvr0000gn/T/starconf-565/star/lib/iwidgets4.0.1/scripts
mkdir /var/folders/ll/34nyr16s1w5_3m896tr29cvr0000gn/T/starconf-565/star/lib/iwidgets4.0.1/demos
mkdir /var/folders/ll/34nyr16s1w5_3m896tr29cvr0000gn/T/starconf-565/star/lib/iwidgets4.0.1/demos/images
mkdir /var/folders/ll/34nyr16s1w5_3m896tr29cvr0000gn/T/starconf-565/star/lib/iwidgets4.0.1/demos/html
cp: cannot overwrite directory /star/./lib/iwidgets with non-directory ./lib/iwidgets
Installation of component /star/manifests/itcl failed

The only solution is to remove the iwidgets directory and re run make install.

[timj]

VTK has the same problem.