libpng conflict in GDAL and mapserver

[assefa]

Tracking a bug on Windows, I realised that there was a conflict beetween the 
libpng linked with mapserver and the libpng distributed with GDAL.
 I made sure that mapserver and GDAL use the same libpng (modifying the 
makefiles in GDAL). This should be verfied each time I make a clean update of 
GDAL.
 
 Threr seems to be no problem on the Unix platform.

[fwarmerdam]

Assefa,

If you have patches for this, I would be happy to modify the windows GDAL
makefiles so that you just have to switch one macro in nmake.opt to control
whether the internal or external libpng is used.  Do you encounter the same
problems with JPEG, or TIFF? 

[fwarmerdam]

Assefa,

Do you have any more information on this?  Should this bug be closed?

[assefa]

Add flags in GDAL makefiles to set external PNG and JPEG libs. Tiff support is 
done through GDAL.