SDL and KDevelop (Jfs Dlt)

You need to add -lSDL to the extra library part of your project settings

in version 2.1.5 you need project->options then select the linker tab add
-lSDL to the additional libararys box–
“The strength of the Constitution lies entirely in the determination of each
citizen to defend it. Only if every single citizen feels duty bound to do
his share in this defense are the constitutional rights secure.”
– Albert Einstein