Bump incorrect minimum HDF5 version to 1.8.15.

INSTALL.md

@@ -80,7 +80,7 @@ full functionality. (See \ref architecture).
 Requirements {#netcdf_requirements}
 ----------------------------------
 
-* HDF5 1.8.9 (netcdf-4 support)
+* HDF5 1.8.15 (netcdf-4 support)
 * zlib 1.2.5
 * curl 7.18.0 (DAP support)
 
@@ -100,7 +100,7 @@ Building with netCDF-4 and the Remote Data Client {#build_default}
 
 The usual way of building netCDF requires the HDF5, zlib, and curl
 libraries. (And, optionally, the szlib library). Versions required are
-at least HDF5 1.8.9, zlib 1.2.5, and curl 7.18.0 or later.
+at least HDF5 1.8.15, zlib 1.2.5, and curl 7.18.0 or later.
 (Optionally, if building with szlib, get szip 2.0 or later.)
 
 These packages are available at:
@@ -332,7 +332,7 @@ For example, one user reports that she can build other applications
 with netCDF-4 by setting the LIBS environment variable:
 
 ~~~
-LIBS='-L/X/netcdf-4.0/lib -lnetcdf -L/X/hdf5-1.8.9/lib -lhdf5_hl -lhdf5 -lz -lm -L/X/szip-2.1/lib -lsz'
+LIBS='-L/X/netcdf-4.0/lib -lnetcdf -L/X/hdf5-1.8.15/lib -lhdf5_hl -lhdf5 -lz -lm -L/X/szip-2.1/lib -lsz'
 ~~~
 
 For shared builds, only -lnetcdf is needed. All other libraries will