To compile for Iomega HMNHD:

- ssh access to HMNHD as described in section dropbear.tar of README.txt

- gcc compiler from codesourcery.com: products/g++/editions/lite/arm GNU/Linux version
(if kernel modules are compiled, gcc 3.4.4, 2005q3-2, should be used,
to remain compatible with existing kernel)

- in case modules are needed: openembedded.org has an oxnas branch
http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/linux/linux-2.6.24/oxnas
(patches which have to be applied to linux-2.6.24 from kernel.org)
kernel config is on running HMNHD in /proc/config.gz (after /sbin/insmod configs.ko)

assuming the arm crosscompiler is installed in /arm9/

compilation of linux needs:
export PATH=/arm9/bin/:$PATH
export CROSS_COMPILE=arm-none-linux-gnueabi-
export ARCH=arm

and xfsprogs-3.0.0 can be compiled with:
export PATH=/arm9/bin/:$PATH

CFLAGS="-I/arm9/include" LDFLAGS="-L/arm9/lib"  CC=arm-none-linux-gnueabi-gcc  LIBTOOL=arm-none-linux-gnueabi-libtool  DEBUG="-DNDEBUG" ./configure --host=arm-none-linux-gnueabi --prefix=/usr --disable-gettext

CFLAGS="-I/arm9/include" LDFLAGS="-L/arm9/lib"  CC=arm-none-linux-gnueabi-gcc LD=arm-none-linux-gnueabi-ld make