and the stubs will be linked in.

   To read and write webp files:
      (1) Download libwebp from sourceforge
      (2) #define HAVE_LIBWEBP   1  (in environ.h)
      (3) In prog/makefile, edit ALL_LIBS to include -lwebp
      (4) The library will be installed into /usr/local/lib.
          You may need to add that directory to LDFLAGS; or, equivalently,
          add that path to the LD_LIBRARY_PATH environment variable.

   To read and write jpeg2000 files:
      (1) Download libopenjp2, version 2.3, fro