||12-31-2013 05:39 AM
So you are on a multilib 64-bit Slackware 14.1 as I expected. You do have the 64-bit libgdiplus installed, but "/usr/lib/libgdiplus.so" is a 32-bit library. It will be found in the 32-bit package of libgdiplus.
For your multilib system you will have to compile a 32-bit package and use the "convertpkg-compat32" script to create a "compat32" version of that 32-bit package and install that on your multilib system.
convertpkg-compat32 -i /tmp/libgdiplus-2.10.9-i486-2_SBo.tgz
upgradepkg --install-new /tmp/libgdiplus-compat32-2.10.9-x86_64-2_SBo.txz
Note: The word "source" in the first command line is an equivalent for using the dot '.' in other examples). And set ARCH to i486, not x86_64, as I show in the second line. I need to update my multilib documentation which still recommends "ARCH=x86_64" which used to be necessary in older Slackware releases.