diff --git a/modules/omp.cmake b/modules/omp.cmake
index 6582608..ebab65f 100644
--- a/modules/omp.cmake
+++ b/modules/omp.cmake
@@ -24,7 +24,25 @@ if(ENABLE_OPENMP)
     find_package(OpenMP)
     if(OPENMP_FOUND)
         if(DEFINED CMAKE_Fortran_COMPILER_ID)
-            set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_Fortran_FLAGS}")
+            # the following works with recent CMake (added Aug 2014)
+            # set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_Fortran_FLAGS}")
+
+            # therefore we use a pedestrian approach:
+            if(CMAKE_Fortran_COMPILER_ID MATCHES GNU)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fopenmp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES Intel)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -openmp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES PGI)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES XL)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qsmp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES Cray)
+                # do nothing in this case
+            endif()
         endif()
         if(DEFINED CMAKE_C_COMPILER_ID)
             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")