File gem_build_cleanup of Package rubygems

#!/bin/sh
if [ ${#*} = 1 ] ; then
    if [ -d "$1" ] ; then
        find $1 \
        \( -name \*.o -o -name Makefile -o -name gem_make.out -o -name mkmf.log -o -name \*.bak -o -name CVS \) \
            -print0 | xargs -r0 rm -v
    else
        echo "'$1' does not exists or is not a directory! Exiting." >&2
        exit 1
    fi
else
    echo "Please pass exact one argument to this script! Exiting." >&2
    exit 1
fi