Support minimal dependency linux build.

test/CMakeLists.txt

@@ -11,15 +11,13 @@ list(APPEND TestFiles
             audio/TestAudioWriter.cpp
             audio/TestMidiReader.cpp
             core/TestBinaryStream.cpp
-			core/TestTomlReader.cpp
+            core/TestTomlReader.cpp
             compiler/TestLexer.cpp
-			compiler/TestTemplatingEngine.cpp
+            compiler/TestTemplatingEngine.cpp
             compression/TestStreamCompressor.cpp
             database/TestDatabase.cpp
             fonts/TestFontReader.cpp
-            graphics/TestOpenGlRendering.cpp
             graphics/TestRasterizer.cpp
-            ipc/TestDbus.cpp
             image/TestPngReader.cpp
             image/TestPngWriter.cpp           
             network/TestNetworkManagerClient.cpp
@@ -30,20 +28,33 @@ list(APPEND TestFiles
             
 if (${HAS_FFMPEG})
 list(APPEND TestFiles 
-	video/TestVideoDecoder.cpp
+    video/TestVideoDecoder.cpp
 )
 endif()
 
 if (${HAS_WAYLAND})
 list(APPEND TestFiles 
-	windows/TestWaylandWindow.cpp
-	)
+    windows/TestWaylandWindow.cpp
+    )
 endif()
 
+find_package(OpenGL QUIET)
+if (OpenGL_FOUND)
+list(APPEND TestFiles 
+    graphics/TestOpenGlRendering.cpp
+    )
+endif()
+
+
 find_package(PkgConfig)            
 pkg_check_modules(DBUS dbus-1)
-include_directories(${DBUS_INCLUDE_DIRS})
-link_directories(${DBUS_LIBRARY_DIRS})
+if (DBUS_FOUND)
+    include_directories(${DBUS_INCLUDE_DIRS})
+    link_directories(${DBUS_LIBRARY_DIRS})
+    list(APPEND TestFiles 
+        ipc/TestDbus.cpp
+    )
+endif()
 
 foreach(TestFile ${TestFiles})
 	cmake_path(GET TestFile FILENAME TestFileName)