David Cole authored Jan 10, 2011 and Brad King committed Jan 11, 2011

Control the root directory of the default directory presented to
the end user of an NSIS installer by a CPack variable.

Previously, the value used in the NSIS script was $PROGRAMFILES,
which is equivalent to the "ProgramFiles" environment variable.
That default value is still the same, but now a project may
override the value by setting this new variable.