Cramming Linux into Limited RAM

On systems with > 64 megabytes RAM: RAM is plentiful, 
can use glibc, bash, libstdc++, etc.

On systems with < 16 megabytes RAM: RAM is scarce,
must use uclibc, busybox, no libstdc++

Can also use an older version of glibc, or omit unused parts

May need to rewrite software a bit (e.g. use libhttp instead of libcurl, or nonblocking I/O instead of threads)