This is probably a really easy (stupid) thing to correct, but I get this error when running ./toolchain.sh - "gmake: not found"
Again, I'm one of the unfortunate people running under Cygwin v2.457.2.2.
I've installed all of the components that're distributed with this version, but still get the same error.
I'm also getting the "underquoted definition of AC_PSPSDK_VERSION" when using automake.
Some Unix versions (e.g. Solaris and maybe some BSDs) have two Makes. The first one is some generic make and the second one is the GNU Make which is called gmake. On Linux and Cygwin GNU Make is installed just as make.