How to Build Mesa with OpenGL version higher than 4.3

On an AMD R9 Fury graphics card, I am successful in building Mesa but 
the highest OpenGL version I can get is 4.3

I know that the release notes for Mesa 12.0.1 says it implements OpengGL 
version 4.3 but https://mesamatrix.net/ looks like it states OpenGL 
version 4.5 extensions has been implemented on mesa and radeonsi.

I've tried building Mesa on the 13.0 branch, with llvm-4.0 and kernel 
version 4.8.0, but I still only OpenGL version 4.3

Is there any way I can build Mesa that implements OpenGL version 4.5?


Here is a snippet of my `glxinfo` output:
*/OpenGL vendor string: X.Org/**/
/**/OpenGL renderer string: Gallium 0.4 on AMD POLARIS10 (DRM 3.3.0 / 
4.8.0-26-generic, LLVM 4.0.0)/**/
/**/OpenGL core profile version string: 4.3 (Core Profile) Mesa 
13.0.0-rc2 (git-f623a8b)/**/
/**/OpenGL core profile shading language version string: 4.30/**/
/**/OpenGL core profile context flags: (none)/**/
/**/OpenGL core profile profile mask: core profile/*

Let me know if there is anymore information I can give that helps.

I appreciate any help,
Thank you!

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