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
See bug 233723.
That looks like a problem with the llvm80 package, not mesa-dri. Do you have any nondefault options?
*** This bug has been marked as a duplicate of bug 233723 ***