diff --git a/build/autotools/m4/lol-gl.m4 b/build/autotools/m4/lol-gl.m4
index 85f3accf..47b277a1 100644
--- a/build/autotools/m4/lol-gl.m4
+++ b/build/autotools/m4/lol-gl.m4
@@ -100,12 +100,7 @@ if test "x${ac_cv_my_stop_looking_for_gl}" = "xno"; then
     LIBS="$LIBS_save"])
 fi
 
-if test "${ac_cv_my_have_gl}" = "no"; then
-  AC_MSG_ERROR([[No OpenGL or OpenGL ES implementation found]])
-fi
-
-
-dnl Use Glew?
+dnl  Use Glew?
 ac_cv_my_have_glew="no"
 PKG_CHECK_MODULES(GLEW, glew,
  [ac_cv_my_have_glew="yes"
@@ -130,12 +125,17 @@ if test "${ac_cv_my_have_glew}" != "no"; then
 fi
 AM_CONDITIONAL(USE_GLEW, test "${ac_cv_my_have_glew}" != "no")
 
-dnl Poor man's GL feature detection if all else failed.
+dnl  Poor man's GL feature detection if all else failed.
 save_LIBS="${LIBS}"
 LIBS="${LIBS} ${GL_LIBS} ${GLES2_LIBS}"
 AC_CHECK_FUNCS(glBegin)
 LIBS="${save_LIBS}"
 
+dnl  Warn if we couldn't find an OpenGL-like API
+if test "${ac_cv_my_have_gl}" = "no"; then
+  AC_MSG_WARN([[No OpenGL or OpenGL ES implementation found]])
+fi
+
 ])# LOL_CHECK_OPENGL
 
 
diff --git a/src/lol/base/enum.h b/src/lol/base/enum.h
index 913ff658..43557b48 100644
--- a/src/lol/base/enum.h
+++ b/src/lol/base/enum.h
@@ -21,9 +21,10 @@ class Enum
 {
 public:
     template<typename T>
-    static String EnumToString(T& parameter)
+    static String EnumToString(T const& parameter)
     {
-        //Create your own
+        UNUSED(parameter);
+        // Create your own
         ASSERT(0);
         return String();
     }
diff --git a/src/scene.cpp b/src/scene.cpp
index fe9a795a..be8d8ba0 100644
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -302,9 +302,11 @@ void Scene::RenderTiles() // XXX: rename to Blit()
     rc.SetAlphaFunc(AlphaFunc::GreaterOrEqual, 0.01f);
 
 #if defined USE_D3D9 || defined _XBOX
-#elif !defined HAVE_GLES_2X
+    /* TODO */
+#elif (defined USE_GLEW || defined HAVE_GL_2X) && !defined HAVE_GLES_2X
     glEnable(GL_TEXTURE_2D);
 #endif
+
     if (!data->m_tile_shader)
         data->m_tile_shader = Shader::Create(LOLFX_RESOURCE_NAME(tile));
     if (!data->m_palette_shader)
@@ -400,7 +402,7 @@ void Scene::RenderTiles() // XXX: rename to Blit()
 
 #if defined USE_D3D9 || defined _XBOX
     /* TODO */
-#elif !defined HAVE_GLES_2X
+#elif (defined USE_GLEW || defined HAVE_GL_2X) && !defined HAVE_GLES_2X
     glDisable(GL_TEXTURE_2D);
 #endif
 }
diff --git a/src/video.cpp b/src/video.cpp
index cf8f008e..85fa31e9 100644
--- a/src/video.cpp
+++ b/src/video.cpp
@@ -65,7 +65,7 @@ void Video::SetDebugRenderMode(DebugRenderMode d)
         {
 #if defined USE_D3D9 || defined _XBOX
 #elif defined HAVE_GLES_2X
-#else
+#elif defined USE_GLEW || defined HAVE_GL_2X
             glEnable(GL_CULL_FACE);
             glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 #endif
@@ -75,7 +75,7 @@ void Video::SetDebugRenderMode(DebugRenderMode d)
         {
 #if defined USE_D3D9 || defined _XBOX
 #elif defined HAVE_GLES_2X
-#else
+#elif defined USE_GLEW || defined HAVE_GL_2X
             glDisable(GL_CULL_FACE);
             glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 #endif
@@ -105,7 +105,7 @@ void Video::Capture(uint32_t *buffer)
 {
 #if defined USE_D3D9 || defined _XBOX
     /* TODO */
-#else
+#elif defined USE_GLEW || defined HAVE_GL_2X || defined HAVE_GLEX_2X
     GLint v[4];
 #   if defined __CELLOS_LV2__
     // FIXME: use psglCreateDeviceAuto && psglGetDeviceDimensions