there seems to be a small packaging issue in the plplot-5.9.8.tar.gz package.
When I try to `make install` on OS X Lion,
Install the project...
-- Install configuration: ""
-- Installing: /usr/local/share/doc/plplot/AUTHORS
-- Installing: /usr/local/share/doc/plplot/COPYING.LIB
CMake Error at cmake_install.cmake:33 (FILE):
file INSTALL cannot find "/Users/jan/Downloads/plplot-5.9.8/ChangeLog".
Obviously it's not too important, simply `touch`ing the file, or moving the ChangeLog.release to ChangeLog makes it work.