Building PostgreSQL on IBM pSeries/SLES 10

It turns out that compiling PostgreSQL on IBM's pSeries isn't that straightforward. Compiling PostgreSQL is very easy, just do a configure; make install and your job is done. However, Red Hat and SuSE on IBM's pSeries are multiarch platforms with 64-bit kernels and 32-bit userspace, capable of running and building 64-bit applications. To build PostgreSQL you have to specify some extra compiler flags. On SLES/ppc64 we had success with the following settings, passed to make:

make CC="gcc -m64" LDREL="-r -melf64ppc"