toolchain/41435: build.sh tools from netbsd-4 fails on cygwin-1.7.0

[jmcneill%invisible.ca@localhost]

>Number:         41435
>Category:       toolchain
>Synopsis:       build.sh tools from netbsd-4 fails on cygwin-1.7.0
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 15 16:05:00 +0000 2009
>Originator:     Jared D. McNeill
>Release:        netbsd-5
>Organization:
>Environment:
CYGWIN_NT-5.1 EEEHA 1.7.0(0.210/5/3) 2009-05-06 14:21 i686 Cygwin
>Description:
Running build.sh -m i386 tools under Cygwin 1.7.0 and a netbsd-5 tree 
eventually fails:

#   compile  asn1_compile/gen.lo
cc -O -I/home/jmcneill/branches/netbsd-5/src/tools/compat/obj -I/home/jmcneill/b
ranches/netbsd-5/src/tools/compat/obj/include  -I/home/jmcneill/branches/netbsd-
5/src/tools/asn1_compile/../compat -DHAVE_NBTOOL_CONFIG_H=1  -D_FILE_OFFSET_BITS
=64 -I.                          -I/home/jmcneill/branches/netbsd-5/src/include/
heimdal  -I/home/jmcneill/branches/netbsd-5/src/crypto/dist/heimdal/lib/asn1 -I/
home/jmcneill/branches/netbsd-5/src/crypto/dist/heimdal/lib/roken        -DKRB5=
1                                -DHAVE_CONFIG_H -DHAVE_IPV6  -c -o gen.lo.o
/home/jmcneill/branches/netbsd-5/src/crypto/dist/heimdal/lib/asn1/gen.c
In file included from /home/jmcneill/branches/netbsd-5/src/crypto/dist/heimdal/l
ib/asn1/gen_locl.h:52,
                 from /home/jmcneill/branches/netbsd-5/src/crypto/dist/heimdal/l
ib/asn1/gen.c:34:
/home/jmcneill/branches/netbsd-5/src/include/heimdal/roken.h:93: error: conflict
ing types for 'asnprintf'
/usr/include/stdio.h:248: error: previous declaration of 'asnprintf' was here
/home/jmcneill/branches/netbsd-5/src/include/heimdal/roken.h:93: error: conflict
ing types for 'asnprintf'
/usr/include/stdio.h:248: error: previous declaration of 'asnprintf' was here
/home/jmcneill/branches/netbsd-5/src/include/heimdal/roken.h:97: error: conflict
ing types for 'vasnprintf'
/usr/include/stdio.h:278: error: previous declaration of 'vasnprintf' was here
/home/jmcneill/branches/netbsd-5/src/include/heimdal/roken.h:97: error: conflict
ing types for 'vasnprintf'
/usr/include/stdio.h:278: error: previous declaration of 'vasnprintf' was here

*** Failed target:  gen.lo

>How-To-Repeat:

>Fix: