Source builder mingw32 fails in gdb

[gds]

I have been able run the builder OK as a native build on fedora for 
rtems 4.10 and 4.11. However, when I attempt to build using ming32 on 
fedora I see this error (it can't find run.exe):

make[3]: Entering directory 
`/home/gene/development/rtems/src/rtems-source-builder/rtems/build/arm-rtems4.10-gdb-7.3.1-1/build-cxc/sim/arm'
/bin/sh ../../../gdb-7.3.1/sim/arm/../../mkinstalldirs 
/home/gene/development/rtems/src/rtems-source-builder/rtems/build/tmp/arm-rtems4.10-gdb-7.3.1-1-root-gene/home/gene/development/rtems/4.10/bin
mkdir -p -- 
/home/gene/development/rtems/src/rtems-source-builder/rtems/build/tmp/arm-rtems4.10-gdb-7.3.1-1-root-gene/home/gene/development/rtems/4.10/bin
/bin/sh ../../../gdb-7.3.1/sim/arm/../../mkinstalldirs 
/home/gene/development/rtems/src/rtems-source-builder/rtems/build/tmp/arm-rtems4.10-gdb-7.3.1-1-root-gene/home/gene/development/rtems/4.10/lib
n=`echo run | sed 's&^&arm-rtems4.10-&'`; \
/usr/bin/install -c run.exe 
/home/gene/development/rtems/src/rtems-source-builder/rtems/build/tmp/arm-rtems4.10-gdb-7.3.1-1-root-gene/home/gene/development/rtems/4.10/bin/$n.exe
/usr/bin/install: cannot stat `run.exe': No such file or directory

uname -a
2.6.35.14-106.fc14.x86_64 #1 SMP Wed Nov 23 13:07:52 UTC 2011 x86_64 
x86_64 x86_64 GNU/Linux

I have run also on newer fc16 and see the same error.

Here's the command line I use to run the builder:

../source-builder/sb-set-builder --host=i686-pc-mingw32 
--log=l-mingw32-4.10-arm.txt --prefix=/home/gene/development/rtems/4.10 
4.10/rtems-arm

Anyone seen this error and know what the problem is?

Thanks,
-gene