Too much automagic trying to find the correct prefix
of HDF5. Remove all the pointless heuristics.
See also: https://bugs.gentoo.org/show_bug.cgi?id=591302

* CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
*   Could NOT find HDF5 (missing: HDF5_LIBRARIES HDF5_INCLUDE_DIRS
*   HDF5_HL_LIBRARIES)

--- xdmf2-1.0_p141226/core/CMakeLists.txt
+++ xdmf2-1.0_p141226/core/CMakeLists.txt
@@ -35,19 +35,7 @@
   mark_as_advanced(FORCE Boost_INCLUDE_DIR)
 endif(Boost_FOUND)
 
-# Find HDF5_ROOT if not set
-if ("$ENV{HDF5_ROOT}" STREQUAL "")
-  find_file (HDF5_LIB libhdf5.so HINTS ENV LD_LIBRARY_PATH)
-  if (NOT "${HDF5_LIB}" STREQUAL "")
-    get_filename_component(HDF5_LIBRARY_DIR "${HDF5_LIB}" PATH)
-    get_filename_component(HDF5_ROOT "${HDF5_LIBRARY_DIR}/../" ABSOLUTE)
-    set(ENV{HDF5_ROOT} ${HDF5_ROOT})
-  endif (NOT "${HDF5_LIB}" STREQUAL "")
-endif ("$ENV{HDF5_ROOT}" STREQUAL "")
-
-mark_as_advanced(CLEAR HDF5_C_INCLUDE_DIR)
-mark_as_advanced(CLEAR HDF5_hdf5_LIBRARY_DEBUG)
-mark_as_advanced(CLEAR HDF5_hdf5_LIBRARY_RELEASE)
+# Find HDF5
 find_package(HDF5 REQUIRED)
 if(HDF5_FOUND)
   mark_as_advanced(FORCE HDF5_C_INCLUDE_DIR)
@@ -73,9 +61,6 @@
   endif(HDF5_IS_PARALLEL)
   get_filename_component(HDF5_ROOT "${HDF5_INCLUDE_DIR}/../" REALPATH)
   set(HDF5_BINARY_DIRS ${HDF5_ROOT}/bin ${HDF5_ROOT}/dll)
-  if (NOT HDF5_LIBRARIES)
-    find_library (HDF5_LIBRARIES hdf5 HINTS ${HDF5_ROOT} ENV LD_LIBRARY_PATH)
-  endif (NOT HDF5_LIBRARIES)
   set(XDMF_LIBRARIES ${XDMF_LIBRARIES} ${HDF5_LIBRARIES})
   set(XDMF_HDF5_BINARY_DIRS ${HDF5_BINARY_DIRS} PARENT_SCOPE)
   set(XDMF_BINARIES ${XDMF_BINARIES} ${HDF5_BINARY_DIRS})