compile failure building system

4 or so days ago now i ran sysupdate; mk nuke && mk clean && mk install && nk. 
yesterday..ish i pulled again to get a few fixes. not seeing any library 
changes in the commit messages i didn't bother with cleaning the tree, i just 
ran mk install. it failed. here are my notes and the error messages:

cpu% uptime
turku up 2 days, 15:34:12
↑ shows how long it was since the last pull and build,
in which i rebuilt the entire system: 
mk nuke && mk clean && mk install && nk

this time i looked at the commits
3505:6b4e19cd75b1   sam, acme
3506:f36af2493c4b   man page
3507:dc4158e7c5e7   devproc (kernel, i presume)
3508:654c1f491c1c   new nntp client
3509:2040bc8b7e0c   fortunes
it didn't look like a library rebuild wasn't needed, 
so i just ran mk install. this happened:

mk eqn
pcc -c main.c
pcc -c tuning.c
pcc -c diacrit.c
pcc -c eqnbox.c
pcc -c font.c
pcc -c fromto.c
pcc -c funny.c
pcc -c glob.c
pcc -c integral.c
yacc -d -S eqn.y
/sys/src/cmd/eqn/integral.c:16[stdin:563] name not declared: SUB
/sys/src/cmd/eqn/integral.c:18[stdin:565] name not declared: SUP
pcc: cpp: 8c 61350: error
mk: pcc -c integral.c  : exit status=rc 61346: pcc 61348: cpp: 8c 61350: error

conflicts: 155 shift/reduce
mk: for(i in 1a ...  : exit status=rc 59191: rc 61299: mk 61305: error
mk: test -e 8._cp ...  : exit status=rc 58721: mk 59177: error
mk: date for (i ...  : exit status=rc 56863: rc 58702: mk 58707: error

i went over the commits, nothing in them relates to eqn in any way, 
so why did it fail this time but not last time?
what about the other 3 errors?

Original issue reported on code.google.com by tereniao...@gmail.com on 2 Apr 2014 at 8:00

cptaffe / plan9front

compile failure building system #198