Built blender raises libwebp.so.5 not found

When I build blender2.8 on my own, building goes without errors but when I try to run it, it crashes raising

error while loading shared libraries: libwebp.so.5: cannot open shared object file: No such file or directory

I have libwebp-dev install via apt-get.
Running blender from https://builder.blender.org/download/ has no problem.

How could I solve this?

OS: Ubuntu 18.04

Not yet resolved.
Anyone have an idea?


I followed this instruction for all missing .so files.