depends -sub CXX gcc  &&
depends cmake  &&
depends fftw   &&
depends JPEG   &&
depends libpng &&
depends tiff   &&
depends zlib   &&

optional_depends  hdf5                \
                  "-DWITH_HDF5=on"    \
                  "-DWITH_HDF5=off"   \
                  "to support fast Fourier transforms"  &&
optional_depends  numpy                   \
                  "-DWITH_VIGRANUMPY=on"  \
                  "-DWITH_VIGRANUMPY=off" \
                  "for vigranumpy module" &&
optional_depends  openexr               \
                  "-DWITH_OPENEXR=on"   \
                  "-DWITH_OPENEXR=off"  \
                  "for openexr support"