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dont build empty directories

--- a/sys/src/cmd/mkfile

+++ b/sys/src/cmd/mkfile

@@ -14,7 +14,7 @@

 NOMK=$NOTSYS|$BUGGERED|$OUTOFDATE

 cpuobjtype=`{sed -n 's/^O=//p' /$cputype/mkfile}

-DIRS=`{ls -l | sed '/^d/!d; s/.* //; /^('$NOMK')$/d'}

+DIRS=`{echo */mkfile | sed 's,/mkfile *,\n,g' | grep -v '^('$NOMK')$'}

 APEDIRS=awk bzip2 compress cvs eqn grap gs links-ape lp pic postscript spin \

 	tex troff

-- 

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