Comment # 7 on bug 1030338 from Michal Srb

Leap 15 has Mesa built with LLVM 5.
Tumbleweed has Mesa built with LLVM 6.

For Leap 42.3 you can use Mesa from X11:XOrg. It is built against LLVM 6 and is
also built against Leap 42.3 repositories.

I am closing this bug since it is fixed in newer version, and while we can not
tell what could be backported to Leap 42.3, it is possible to use the newer
package in Leap 42.3.