[OctDev] Configure recognizes libpng, libjpeg, gsl and qhull and their header files initially but still reports not found in the end.

[R S A. M. <rsa...@sa...>]

Hello:

I am trying to compile octave-forge-2004.11.16 on a Slackware 10.1
system. I have installed cln, ginac, libpng, libjpeg, gsl, qhull along 
with their corresponding header files. But when I run
./configure --prefix=/usr --build=i486-slackware-linux
it recognizes only ginac in the end.

I have attached config.log file. As we can see from this, all the 
library files mentioned above and their header files are recognized 
earlier but still configure reports libpng, libjpeg, gsl and qhull not 
found in the end! What is the problem?

Can anybody help? Thanks for your help.

Anand