Plan9port lex segfault for unknown reasons, as a workaround, we just disable
the faulty lex programs.

Patch by Andy Spencer

  http://code.swtch.com/plan9port/issue/77/
--- plan9/src/cmd/mkfile
+++ plan9.new/src/cmd/mkfile
@@ -1,10 +1,10 @@
 <$PLAN9/src/mkhdr
 
-TARG=`ls *.[cy] *.lx | egrep -v "\.tab\.c$|^x\." | sed 's/\.[cy]//; s/\.lx//'`
+TARG=`ls *.[cy] | egrep -v "\.tab\.c$|^x\." | sed 's/\.[cy]//; s/\.lx//'`
 
 <$PLAN9/src/mkmany
 
-BUGGERED='CVS|faces|factotum|lp|ip|mailfs|upas|vncv|mnihongo|mpm|index|u9fs|secstore|smugfs'
+BUGGERED='CVS|faces|factotum|lp|ip|mailfs|upas|vncv|mnihongo|mpm|index|u9fs|secstore|smugfs|grap|pic|tpic'
 DIRS=lex `ls -l |sed -n 's/^d.* //p' |egrep -v "^($BUGGERED)$"|egrep -v '^lex$'`
 
 <$PLAN9/src/mkdirs