strstream.h is now called "strstream" and is obsolete, but use it anyway until
all code is converted over. This also needs std:: added, at least for GCC
4.2.1. Lastly, when hardcoding the path to perl, /usr/bin/perl should be used
rather than anything else.
Patch from Pascal Stumpf <Pascal.Stumpf@cubes.de>
Most is just copied from the existing imake installation in
/usr/X11R6. Additionally:
* Allow overriding CDESharedRev, X11ProjectRoot and ProjectRoot
* Add a new define to be able to override MINCLUDESRC too
(this allows me to build CDE without symlinking any include directories)