depends -sub CXX gcc && depends cmake && optional_depends fftw \ "--with-fftw" \ "--without-fftw" \ "to support fast Fourier transforms" && optional_depends JPEG \ "--with-jpeg" \ "--without-jpeg" \ "for jpeg support" && optional_depends libpng \ "--with-png" \ "--without-png" \ "for png support" && optional_depends numpy \ "" \ "" \ "for vigranumpy module" && optional_depends tiff \ "--with-tiff" \ "--without-tiff" \ "for tiff support" && optional_depends zlib \ "--with-zlib" \ "--without-zlib" \ "for using zlib compression library"