Added -lhdf5 to check for H5get_libversion.

configure

@@ -27424,7 +27424,7 @@ for ac_lib in '' netcdf; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib -lhdf5 $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_H5TS_mutex_lock=$ac_res
@@ -27485,7 +27485,7 @@ for ac_lib in '' netcdf; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib -lhdf5 $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_H5get_libversion=$ac_res

m4/acx_options.m4

@@ -141,11 +141,11 @@ AC_ARG_WITH([netcdf],
 
 AS_IF([test "x$ENABLE_NC4HDF5" = "xyes"],
       [AC_SEARCH_LIBS([H5TS_mutex_lock], [netcdf],
-               [AC_DEFINE([HAVE_NC4HDF5_THREADSAFE],[1],[Define to 1 for NetCDF4/HDF5 threadsafe support])],,)])
+               [AC_DEFINE([HAVE_NC4HDF5_THREADSAFE],[1],[Define to 1 for NetCDF4/HDF5 threadsafe support])],,[-lhdf5])])
 
 AS_IF([test "x$ENABLE_NC4HDF5" = "xyes"],
       [AC_SEARCH_LIBS([H5get_libversion], [netcdf],
-               [AC_DEFINE([HAVE_H5GET_LIBVERSION],[1],[Define to 1 for H5get_libversion support])],,)])
+               [AC_DEFINE([HAVE_H5GET_LIBVERSION],[1],[Define to 1 for H5get_libversion support])],,[-lhdf5])])
 
 AC_SUBST([ENABLE_NETCDF])
 AC_SUBST([ENABLE_NC2])