build ruby for arm platform (e.g. for amazon kindle)

gistfile1.sh

echo "deb http://emdebian.org/debian/ lenny main" >> /etc/apt/sources.list
apt-get update
apt-get install binutils-arm-linux-gnueabi gcc-4.3-arm-linux-gnueabi libc6-dev-armel-cross

cd /path/to/ruby/1.8.7/sources
autoconf
CFLAGS="--static" LDFLAGS="--static" CC="arm-linux-gnueabi-gcc" ac_cv_func_setpgrp_void=yes ac_cv_func_isinf=no ac_cv_func_isnan=no ac_cv_func_finite=no CROSS_COMPILING=1 ./configure --host="arm-linux-gnueabi" --prefix=/mnt/us/opt
make
make install

# now you have to copy contents of /mnt/us/opt to your device and everything should work