IMAP compile errors

["Paul Fontenot" <paul@pitbull-productions.com>]

I get the following error when compile the IMAP-UW port on an Openbsd Sparc
2.8:

cc -O2 -pipe   -c mbx.c
mbx.c: In function `mbx_hdrpos':
mbx.c:1371: internal error--unrecognizable insn:
(insn 78 76 80 (set (reg:SI 129)
        (minus:SI (const_int 4 [0x4])
            (const_int -4096 [0xfffff000]))) -1 (nil)
    (expr_list:REG_EQUAL (const_int 4100 [0x1004])
        (nil)))
*** Error code 1

Stop in /usr/ports/mail/imap-uw/work/imap-2000/c-client.
*** Error code 1

Stop in /usr/ports/mail/imap-uw/work/imap-2000/c-client (line 214 of
Makefile).
*** Error code 1

Stop in /usr/ports/mail/imap-uw/work/imap-2000 (line 423 of Makefile).
*** Error code 1

Stop in /usr/ports/mail/imap-uw/work/imap-2000 (line 319 of Makefile).
*** Error code 1

Stop in /usr/ports/mail/imap-uw (line 1607 of
/usr/ports/infrastructure/mk/bsd.port.mk).