adds all directories specified in `ACLOCAL_PATH' to the `aclocal'
command line as `-I' flags. Also, it provides a setup hook that
adds the `.../share/aclocal' directory of every build input to
`ACLOCAL_PATH'.
* Upgraded Libtool.
* Graphviz requires the X Athena widgets, which in turn requires the X
miscellaneous utilities library; added those. However it doesn't
work yet since libXt is broken.
svn path=/nixpkgs/trunk/; revision=888