hdf5_ep

[svn-r5807] Purpose:
    Update, Bug Fix, and Feature Add
Description:
    - Updated how AC_{ENABLE,WITH} help messages were being generated.
      Autoconf now gives you an AC_HELP_STRING macro to use to create
      them.

    - Fixed the problem with Linux LFS on RedHat 7.3 machines. It wasn't
      finding getdents64(), so we can't rely on that being present
      anymore...

    - Added GPFS detection and setting.

    - Updated how compression is specified. It's no longer necessary to
      test for HAVE_ZLIB_H, HAVE_LIBZ, and HAVE_COMPRESS2. The one macro
      {H5_}HAVE_COMPRESSION takes care of all of these.
Solution:
    Changed the check for Linux LFS from looking for getdents() to
    looking at the version number of the kernel (using the uname -r
    command). You can still override with the --enable-linux-lfs switch
    if you really believe that your <2.4 kernel has LFS support.
Platforms tested:
    Linux (2.2 and 2.4)