maintainer-feedback requested: [Bug 239852] /usr/ports/x11/xorg error

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Bug 239852: /usr/ports/x11/xorg error
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239852



--- Description ---
after 
cd /usr/ports/x11/xorg

and

make install clean

I receive :

====> Compressing man pages (compress-man)
===>  Installing for bison-3.4.1,1
===>  Checking if bison is already installed
===>   Registering installation for bison-3.4.1,1 as automatic
Installing bison-3.4.1,1...
===>   mesa-dri-18.3.2_4 depends on executable: bison - found
===>   Returning to build of mesa-dri-18.3.2_4
===>   mesa-dri-18.3.2_4 depends on executable: msgfmt - found
===>   mesa-dri-18.3.2_4 depends on executable: gmake - found
===>   mesa-dri-18.3.2_4 depends on package: pkgconf>=1.3.0_1 - found
===>   mesa-dri-18.3.2_4 depends on file: /usr/local/bin/python2.7 - found
===>   mesa-dri-18.3.2_4 depends on package: llvm80>=3.9.0_4 - not found
===>  llvm80-8.0.1_2 needs Python 3.6 at least, but 2.7 was specified.
*** Error code 1

Stop.
make[4]: stopped in /usr/ports/devel/llvm80
*** Error code 1

Stop.
make[3]: stopped in /usr/ports/graphics/mesa-dri
*** Error code 1

Stop.
make[2]: stopped in /usr/ports/graphics/mesa-dri
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/x11/xorg
*** Error code 1

Stop.
make: stopped in /usr/ports/x11/xorg