SCons now uses installed libtiff, if a compatible one is available. Added platform/README to explain config files.
Yet some mingw related changes.
More fixes for mingw build/install.
Scons update for mingw.
Renamed librt.a to librtrad.a to avoid conflict on Solaris.
Added pmdblur.csh and ran2tiff.csh install for SCons.
Cleaned up tifflib support (don't copy header files to common during build).
Updates to SConscripts for 3R7.
Install ra_pvm.csh on posix systems.
Removed more obsolete stuff, added pcwarp again.
Removed obsolete files and programs from SCons build.
Compatibility fixes as suggested by Siegbert Debatin.
SCons build simplifications.
x11findwin.c needed the X11 include path.
Updated SCons build environment to work with a fresh download and on OS X, as suggested by Randolph Fritz.
Added new ra_bmp.c.
Made tifflib compile a bit more robust.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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