 a file
   stream interface.  This is convenient for compressing and decompressing
   image data to memory rather than to file.  Stubs are provided
   for all these I/O functions.  Default is to enable them; OSX developers
   must disable by setting #define HAVE_FMEMOPEN  0  (in environ.h).
   If these functions are not enabled, raster to compressed data in
   memory is accomplished safely but through a temporary file.
   See 9 for more details on image I/O formats.

   If you're building with the autoconf 