A default PDL build with MinGW and ASperl does not build the PROJ4 stuff.
A look at the existing Makefile.PL's show that they are unix-based. It looks like
a more OS neutral build configuration could be made to work for win32 and
mac os x and linux/unix platforms.
I am entering it with priority 7 as a placeholder for the required development.
I consider the PROJ4 support one of the key PDL capabilities that needs to
be in a win32 PDL.