try to use pkg-config to find libhdf5 and openmpi

CMakeLists.txt

@@ -661,7 +661,33 @@ endif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
             if (WIN32)
                 find_package(HDF5 COMPONENTS NO_MODULE REQUIRED static)
             else()
-                find_package(HDF5 REQUIRED)
+                find_package(PkgConfig)
+                pkg_search_module(HDF5 REQUIRED hdf5-serial)
+                if(NOT HDF5_FOUND)
+                    find_package(HDF5 REQUIRED)
+                else()
+                    add_compile_options(${HDF5_CFLAGS})
+                    link_directories(${HDF5_LIBRARY_DIRS})
+                    link_libraries(${HDF5_LIBRARIES})
+                    find_file(Hdf5dotH hdf5.h PATHS ${HDF5_INCLUDE_DIRS} NO_DEFAULT_PATH)
+                    if(NOT Hdf5dotH)
+                        message( FATAL_ERROR "hdf5-serial not found in an error message above.")
+                    endif()
+                endif()
+                check_include_file_cxx(hdf5.h HDF5_FOUND)
+                if(NOT HDF5_FOUND)
+                    message( FATAL_ERROR "hdf5.h was not found.")
+                endif()
+
+                # Med Fichier can require MPI
+                pkg_search_module(OPENMPI REQUIRED ompi-cxx)
+                add_compile_options(${OPENMPI_CFLAGS})
+                link_directories(${OPENMPI_LIBRARY_DIRS})
+                link_libraries(${OPENMPI_LIBRARIES})
+                find_file(MpidotH mpi.h PATHS ${OPENMPI_INCLUDE_DIRS} NO_DEFAULT_PATH)
+                if(NOT MpidotH)
+                    message( FATAL_ERROR "mpi.h was not found. Check for error above.")
+                endif()
             endif()
             find_package(MEDFile REQUIRED)
             set(SMESH_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/src/3rdParty/salomesmesh/inc)