Find mkl.h on more icc versions

Refs #1110

Change-Id: I0b6bc2497fc2a504b6c29b0697ee9e354fe6cffd

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b4d6cd6d7c91fc6752fec0b333fb421324c4c23..5a3aae2e3f7b577f7f1f3e6d43f8b9d8753650ac 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -976,6 +976,10 @@ elseif(${GMX_FFT_LIBRARY} STREQUAL "MKL")
         else()
             set(FFT_LINKER_FLAGS "-mkl=sequential")
         endif()
+        # Some versions of icc require this in order that mkl.h can be
+        # found at compile time.
+        set(EXTRA_C_FLAGS "${EXTRA_C_FLAGS} ${FFT_LINKER_FLAGS}")
+
         set(MKL_ERROR_MESSAGE "Make sure you have configured your compiler so that ${FFT_LINKER_FLAGS} will work.")
     else()
         # The user will have to provide the set of magic libraries in