Index: unittests/SymbolFile/PDB/SymbolFilePDBTests.cpp
===================================================================
--- unittests/SymbolFile/PDB/SymbolFilePDBTests.cpp
+++ unittests/SymbolFile/PDB/SymbolFilePDBTests.cpp
@@ -10,7 +10,11 @@
 #include "gtest/gtest.h"
 
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Config/config.h"
+#ifdef _MSC_VER // DIA SDK is available only when using MSVC
+#   include "llvm/Config/config.h"
+#else
+#   define HAVE_DIA_SDK 0
+#endif
 #include "llvm/DebugInfo/PDB/PDBSymbolData.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolExe.h"
 #include "llvm/Support/FileSystem.h"