Compiling GNU tools on QNAP box - busybox linux

1. Use the ipkg utility to install the following - not exhaustive - list

1. gcc
2. sed
3. pcre
4. pcre-dev 
5. gmp 
6. optware-devel

gcc and sed are the important ones - without those, configure won't run

2. Set the LD_LIBRARY_PATH to /opt/lib

3. Set C_INCLUDE_PATH/CPLUS_INCLUDE_PATH to /opt/include

3. run  configure, make and install in the usual way.