diff --git a/source/build/include/baselayer.h b/source/build/include/baselayer.h
index 9f5a2d4b4..24f97a213 100644
--- a/source/build/include/baselayer.h
+++ b/source/build/include/baselayer.h
@@ -117,6 +117,8 @@ struct glinfo_t {
     char debugoutput;
     char bufferstorage;
     char sync;
+    char depthclamp;
+    char clipcontrol;
     char dumped;
 };
 
diff --git a/source/build/src/baselayer.cpp b/source/build/src/baselayer.cpp
index 9db853026..1340ffa6f 100644
--- a/source/build/src/baselayer.cpp
+++ b/source/build/src/baselayer.cpp
@@ -285,6 +285,8 @@ struct glinfo_t glinfo =
     0,          // Debug Output
     0,          // Buffer storage
     0,          // Sync
+    0,          // Depth Clamp
+    0,          // Clip Control
     0,          // GL info dumped
 };
 
diff --git a/source/build/src/sdlayer.cpp b/source/build/src/sdlayer.cpp
index 8d50dac42..f4faf688c 100644
--- a/source/build/src/sdlayer.cpp
+++ b/source/build/src/sdlayer.cpp
@@ -1350,6 +1350,8 @@ void sdlayer_setvideomode_opengl(void)
     glinfo.debugoutput = !!Bstrstr(glinfo.extensions, "GL_ARB_debug_output");
     glinfo.bufferstorage = !!Bstrstr(glinfo.extensions, "GL_ARB_buffer_storage");
     glinfo.sync = !!Bstrstr(glinfo.extensions, "GL_ARB_sync");
+    glinfo.depthclamp = !!Bstrstr(glinfo.extensions, "GL_ARB_depth_clamp");
+    glinfo.clipcontrol = !!Bstrstr(glinfo.extensions, "GL_ARB_clip_control");
 
     if (Bstrstr(glinfo.extensions, "WGL_3DFX_gamma_control"))
     {
diff --git a/source/build/src/winlayer.cpp b/source/build/src/winlayer.cpp
index 6500d4fa6..33c60f4f0 100644
--- a/source/build/src/winlayer.cpp
+++ b/source/build/src/winlayer.cpp
@@ -2929,6 +2929,14 @@ static int32_t SetupOpenGL(int32_t width, int32_t height, int32_t bitspp)
             {
                 glinfo.sync = 1;
             }
+            else if (!Bstrcmp((char *)p2, "GL_ARB_depth_clamp"))
+            {
+                glinfo.depthclamp = 1;
+            }
+            else if (!Bstrcmp((char *)p2, "GL_ARB_clipcontrol"))
+            {
+                glinfo.clipcontrol = 1;
+            }
         }
         Xfree(p);
     }