as86 command not found when compiling lilo

highness

when compiling lilo, there 's error

DLILO=0x4c7c8088 `( if [ -r $ROOT/etc/lilo.defines ]; then cat $ROOT/etc/lilo.defines; else echo -DBDATA -DDSECS=3 -DEVMS -DIGNORECASE -DLVM -DONE_SHOT -DPASS160 -DREISERFS -DREWRITE_TABLE -DSOLO_CHAIN -DVERSION -DVIRTUAL; fi ) | sed 's/-D/-DLCF_/g'` -DFIRST=0x199d1f05 -o first.s first.S
gcc -E -C -traditional -DLILO_ASM -o common.s common.h
as86 -0 -a -w -l first.lis -o first.o first.s
make: as86: Command not found
make: *** [first.o] Error 127

where's the as86??