include/plan9/mklibc.rc

#!/bin/rc

pattern='/umuldiv/d
	/UTFmax/d
	/Runesync/d
	/Runeself/d
	/Runeerror/d
	/Runemax/d
	/rune routines/,/^\/\*/d
	/print routines/,/^\/\*/d
	/error string for/,/^\/\*/d'

sed -e $pattern /sys/include/libc.h