The is_name and is_in_name macros are FUBAR'ed.

Due to the use of signed vs. unsigned chars on our various platforms, one gets
"warning: comparison is always true due to limited range of data type"
from GCC 3.3.

bin/sh/Makefile

@@ -21,6 +21,8 @@ LFLAGS= -8	# 8-bit lex scanner for arithmetic
 CFLAGS+=-DSHELL -I. -I${.CURDIR}
 # for debug:
 # CFLAGS+= -g -DDEBUG=2
+WARNS=	0
+WFORMAT=0
 
 .PATH:	${.CURDIR}/bltin \
 	${.CURDIR}/../../bin/test