I have PNG driver working. Here's how.
Compile GD2.0.7
./configure --prefix=/scratch/local [create a local library]
make install
get rid of all but libgd.a [I'm doing a static linked library]
Recompile Grass 5.0.0
./configure ... --with-gdal-includes=/scratch/local/include --with-gdal-libs='/scratch/local/lib /usr/ucblib' ...
[I found the ucblib hiding in /usr/ucblib, libpng requires this.]
Edit ".../src/CMD/head/head.sparc-sun-solaris2.7" On GDLIB line, added -lm
make
make install
Everything compiles/links. PNG driver fails.
ADD to LD_LIBRARY_PATH.
In .cshrc file: setenv LD_LIBRARY_PATH {$LD_LIBRARY_PATH}:/usr/ucblib to add a search path
PNG driver now works.
Notes:
(1) On my system GD is configured as:
Support for PNG library: yes
Support for JPG library: yes
Support for Freetype 2.x library: no
Support for Xpm library: no
(2) GD2.0.7 I think tries to improve its library support (?)
It installs libgd.a,libgd.so.2.0.0 as well as 2 links libgd.so, libgd.so.2 both
linked to libgd.so.2.0.0.
There is also a file libgd.la which is related to the "GNU libtool" stuff.
Within libgd.la is a dependency_libs line.
On my system this is: -L/usr/openwin/lib /usr/local/lib/libjpeg.la -lpng -lz -lm
(3) There are 2 different true color environment variables involved.
XDRIVER_TRUECOLOR controls the display driver use of true color (not actually needed for PNG driver)
GRASS_TRUECOLOR controls the PNG driver use of true color
Thanks, Glynn Clements, for your help.
John