Was ast.c overlooked in the recent com driver changes?
I'm getting:
cc  -O2 -Werror -Wall -Wmissing-prototypes -Wstrict-prototypes -I. -I../../../..
/arch -I../../../.. -nostdinc -DSWAPPAGER -DVNODEPAGER -DDEVPAGER -DEXEC_AOUT -D
EXEC_SCRIPT -DI486_CPU -DVM86 -DDUMMY_NOPS -DXSERVER -DUCONSOLE -DINSECURE -DRTC
_OFFSET="0" -DSYSVMSG -DSYSVSEM -DSYSVSHM -DCOMPAT_NOMID -DCOMPAT_11 -DCOMPAT_12
 -DCOMPAT_43 -DTCP_COMPAT_42 -DUSER_LDT -DLKM -DFFS -DMFS -DNFS -DCD9660 -DMSDOS
FS -DKERNFS -DUNION -DNFSSERVER -DFIFO -DGATEWAY -DINET -DNETATALK -DNMBCLUSTER=
"0x800" -DPPP_BSDCOMP -DPPP_DEFLATE -DEISAVERBOSE -DMAXUSERS=64 -D_KERNEL  -Di38
6  -c ../../../../dev/isa/ast.c
../../../../dev/isa/ast.c: In function `astprint':
../../../../dev/isa/ast.c:136: dereferencing pointer to incomplete type
../../../../dev/isa/ast.c: In function `astattach':
../../../../dev/isa/ast.c:147: storage size of `ca' isn't known
cc1: warnings being treated as errors
../../../../dev/isa/ast.c:147: warning: unused variable `ca'
*** Error code 1

Stop.