Oh dear.  Seems like somebody's forgotten that 'char' != 'signed char' on 
all platforms....

/work/rearnsha/netbsd/build/cats/tools/bin/arm--netbsdelf-gcc -O2  -Wall 
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wno-sign-compare 
-Wno-traditional -Wno-uninitialized  -Werror   -DLOGFAC=LOG_LOCAL0 
-I/work/rearnsha/netbsd/src/dist/ipf -I/work/rearnsha/netbsd/src/dist/ipf/t
ools -I/work/rearnsha/netbsd/src/sys -I/work/rearnsha/netbsd/src/sys/netine
t -DSTATETOP -D__UIO_EXPOSE  -nostdinc -isystem /work/rearnsha/netbsd/build
/cats/install/usr/include  -c    /work/rearnsha/netbsd/src/dist/ipf/tools/i
pmon.c
/work/rearnsha/netbsd/src/dist/ipf/tools/ipmon.c: In function 
`print_ipflog': /work/rearnsha/netbsd/src/dist/ipf/tools/ipmon.c:1035: 
warning: comparison is always false due to limited range of data type

R.