I am getting the following compilation error when trying to compile the latest stable version of the engine (3.1) on Linux Mint 19 (platform=x11):
[Initial build] Linking Static Library ==> core/libcore.x11.tools.64.a
Ranlib Library ==> core/libcore.x11.tools.64.a
[Initial build] Linking Program ==> bin/godot.x11.tools.64
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status
scons: *** [bin/godot.x11.tools.64] Error 1
scons: building terminated because of errors.
All prerequisites appear to be correctly installed. Can somebody help me out please? I would like to compile the engine as I am adding an external C++ module.
Screenshot #1: Compilation error
Screenshot #2: Prerequisites