DEFAULT_VERSIONS+=llvm=90 ignored?

[Steve Kargl]

It takes a long time to compile on my laptop.  I have

DEFAULT_VERSIONS+=llvm=90

in my /etc/make.conf.  I go to update gnuplot and get

% portmaster -Byd gnuplot
...
        Install devel/llvm10
...
        Install devel/llvm90

Does it really take two versions of llvm to compile
gnuplot and dependencies?  Is something broken in
the ports *.mk files?

-- 
Steve