if [[ -e ${SOURCE_CACHE}/${SOURCE} ]] ; then
  message  "${MESSAGE_COLOR}Found source file"  \
           "${FILE_COLOR}${SOURCE}${DEFAULT_COLOR}"
else
  message  "${MESSAGE_COLOR}Downloading source file"  \
           "${FILE_COLOR}${SOURCE}${DEFAULT_COLOR}"  &&
  wget --no-check-certificate ${SOURCE_URL} -O ${SOURCE_CACHE}/${SOURCE}
fi
