args : with args; let localDefs = builderDefs.meta.function { src = fetchurl { url = ftp://ftp.fftw.org/pub/fftw/fftw-3.1.2.tar.gz; sha256 = "1gr63hf5vvsg50b2xwqaxwpvs1y9g8l0sb91a38wpvr7zsbjxfg1"; }; buildInputs = []; configureFlags = ["--enable-shared"] ++ (if args.singlePrecision then [ /*"--enable-single" */] else ["--enable-float"]); # some distros seem to be shipping both versions within the same package? # why does --enable-single still result in ..3f.so instead of ..3.so? }; in with localDefs; stdenv.mkDerivation { name = "fftw-3.1.2" + ( if args.singlePrecision then "-single" else "-float" ); builder = writeScript "fftw-3.1.2-builder" (textClosure localDefs [doConfigure doMakeInstall doForceShare]); meta = { description = " Fastest Fourier Transform in the West library. "; inherit src; }; }