How i've setup fftw: let . be this directory ./fftw-3.2.2 - version 3.2.2 - contains code from tar file downloaded from fftw homesite - Directories added by phil.. ./archsrc - source directories for different architectures - ./xeon5400 - summer1 cpu holds 64 bit version ./archobj - directories holding compiled libs/exectuables - ./xeon5400 - make in archsrc/xeon5400 puts objects here - doitphil - will generate double,float, shared objected and static linked libs for a particular family (eg fam=xeon5400). sse2 for the to ./fftw-3.3.2 - version 3.3.2 this supports avx instructions on linux kernels > 2.6.30. megs3 supports it with opensuse 11.4 ?? I've left optSSE,2 out,, just avx