SO to make the long story short, when I build libde265 from the source using autotools (configure script) it produces a shared object named "libde265.so".

But! When I'll use cmake build system, the produced shared object name is "liblibde265.so", which makes it undetectable by external projects like ImageMagick:
https://github.com/ImageMagick/ImageMagick/issues/5783 
Wrong library shared object name when using Cmake build system
This is a GitHub Issue
repo:libde265
owner:strukturag
Title : Wrong library shared object name when using Cmake build system
Issue date:

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SO to make the long story short, when I build libde265 from the source using autotools (configure script) it produces a shared object named "libde265.so".

But! When I'll use cmake build system, the produced shared object name is "liblibde265.so", which makes it undetectable by external projects like ImageMagick:
https://github.com/ImageMagick/ImageMagick/issues/5783 
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