OpenCPN Version 2.6 Beta Build 1511

[nohal]

bzs...
As far as I remember, there's nothing like development packages in Slackware, you get everything needed for development with the normal package.
From the messages you posted, make sure you have at least the following installed (wild guess from 2 minutes spent at http://slackfind.net/):
http://download.salixos.org/i486/sla...4.4-i486-1.txz
http://download.salixos.org/i486/sla...0.6-i486-1.txz
http://download.salixos.org/i486/sla...9.2-i486-1.txz

If it doesn't help, cmake on Slackware is probably not patched properly and you will have to find the respective includes and correct the paths in CMakeCache.txt in the build directory. Good luck with that...

BTW, you certainly win my personal contest for the most bizarre distro used amongst our users

And login as root is pure evil...

Good luck

Pavel