diff --git a/glxbackend.cpp b/glxbackend.cpp
index a9228f73ee..8b2360a8b0 100644
--- a/glxbackend.cpp
+++ b/glxbackend.cpp
@@ -68,12 +68,10 @@ GlxBackend::~GlxBackend()
 void GlxBackend::init()
 {
     initGLX();
-    // check for FBConfig support
-    if (!hasGLExtension("GLX_SGIX_fbconfig") || !glXGetFBConfigAttrib || !glXGetFBConfigs ||
-            !glXGetVisualFromFBConfig || !glXCreatePixmap || !glXDestroyPixmap ||
-            !glXCreateWindow || !glXDestroyWindow) {
-        setFailed("GLX_SGIX_fbconfig or required GLX functions missing");
-        return; // error
+    // require at least GLX 1.3
+    if (!hasGLXVersion(1, 3)) {
+        setFailed("Requires at least GLX 1.3");
+        return;
     }
     if (!initDrawableConfigs()) {
         setFailed("Could not initialize the drawable configs");
diff --git a/libkwineffects/kwinglutils_funcs.cpp b/libkwineffects/kwinglutils_funcs.cpp
index 71fd25c7d2..4482328664 100644
--- a/libkwineffects/kwinglutils_funcs.cpp
+++ b/libkwineffects/kwinglutils_funcs.cpp
@@ -66,14 +66,6 @@ glXCopySubBuffer_func glXCopySubBuffer;
 glXGetVideoSync_func glXGetVideoSync;
 glXWaitVideoSync_func glXWaitVideoSync;
 glXSwapInterval_func glXSwapInterval;
-// GLX_SGIX_fbconfig
-glXGetFBConfigAttrib_func glXGetFBConfigAttrib;
-glXGetVisualFromFBConfig_func glXGetVisualFromFBConfig;
-glXCreateWindow_func glXCreateWindow;
-glXDestroyWindow_func glXDestroyWindow;
-glXCreatePixmap_func glXCreatePixmap;
-glXDestroyPixmap_func glXDestroyPixmap;
-glXGetFBConfigs_func glXGetFBConfigs;
 
 // glActiveTexture
 glActiveTexture_func glActiveTexture;
@@ -189,15 +181,6 @@ void glxResolveFunctions()
     } else {
         glXSwapInterval = NULL;
     }
-
-    OpenGLPlatformInterface platformInterface = GlxPlatformInterface;
-    GL_RESOLVE_WITH_EXT(glXGetFBConfigAttrib, glXGetFBConfigAttribSGIX);
-    GL_RESOLVE_WITH_EXT(glXGetVisualFromFBConfig, glXGetVisualFromFBConfigSGIX);
-    GL_RESOLVE(glXGetFBConfigs);
-    GL_RESOLVE(glXCreateWindow);
-    GL_RESOLVE(glXDestroyWindow);
-    GL_RESOLVE(glXCreatePixmap);
-    GL_RESOLVE(glXDestroyPixmap);
 }
 #endif
 
diff --git a/libkwineffects/kwinglutils_funcs.h b/libkwineffects/kwinglutils_funcs.h
index f7dc50921e..675088beca 100644
--- a/libkwineffects/kwinglutils_funcs.h
+++ b/libkwineffects/kwinglutils_funcs.h
@@ -203,24 +203,6 @@ typedef int (*glXSwapInterval_func)(int ratio);
 extern KWIN_EXPORT glXGetVideoSync_func glXGetVideoSync;
 extern KWIN_EXPORT glXWaitVideoSync_func glXWaitVideoSync;
 extern KWIN_EXPORT glXSwapInterval_func glXSwapInterval;
-// GLX_SGIX_fbconfig and misc GLX 1.3 stuff
-typedef int (*glXGetFBConfigAttrib_func)(Display *dpy, GLXFBConfig config,
-        int attribute, int *value);
-typedef XVisualInfo*(*glXGetVisualFromFBConfig_func)(Display *dpy, GLXFBConfig config);
-extern KWIN_EXPORT glXGetFBConfigAttrib_func glXGetFBConfigAttrib;
-extern KWIN_EXPORT glXGetVisualFromFBConfig_func glXGetVisualFromFBConfig;
-typedef GLXWindow(*glXCreateWindow_func)(Display *dpy, GLXFBConfig config,
-        Window win, const int *attribList);
-typedef void (*glXDestroyWindow_func)(Display *dpy, GLXWindow window);
-typedef GLXPixmap(*glXCreatePixmap_func)(Display *dpy, GLXFBConfig config,
-        Pixmap pixmap, const int *attribList);
-typedef void (*glXDestroyPixmap_func)(Display *dpy, GLXPixmap pixmap);
-typedef GLXFBConfig*(*glXGetFBConfigs_func)(Display *dpy, int screen, int *nelements);
-extern KWIN_EXPORT glXCreateWindow_func glXCreateWindow;
-extern KWIN_EXPORT glXDestroyWindow_func glXDestroyWindow;
-extern KWIN_EXPORT glXCreatePixmap_func glXCreatePixmap;
-extern KWIN_EXPORT glXDestroyPixmap_func glXDestroyPixmap;
-extern KWIN_EXPORT glXGetFBConfigs_func glXGetFBConfigs;
 
 // glActiveTexture
 typedef void (*glActiveTexture_func)(GLenum);