diff -ur clx-0.7.4.orig/gl.lisp clx-0.7.4/gl.lisp
--- clx-0.7.4.orig/gl.lisp	2009-11-28 16:43:30.000000000 +0100
+++ clx-0.7.4/gl.lisp	2009-11-29 22:46:37.000000000 +0100
@@ -2274,7 +2274,7 @@
   (let ((constant 0)
         (calculated ()))
     (loop
-       for (name type length length-var) in argspecs
+       for (nil type length length-var) in argspecs
        do (let ((byte-width (byte-width type)))
             (typecase length
               (number (incf constant (* byte-width length)))
@@ -2287,7 +2287,7 @@
 
 (defun composite-args (argspecs)
   (loop
-     for (name type length length-var) in argspecs
+     for (nil nil length length-var) in argspecs
      when (consp length)
      collect (list length-var length)))
 
diff -ur clx-0.7.4.orig/xrender.lisp clx-0.7.4/xrender.lisp
--- clx-0.7.4.orig/xrender.lisp	2009-11-28 16:43:30.000000000 +0100
+++ clx-0.7.4/xrender.lisp	2009-11-29 22:50:42.000000000 +0100
@@ -408,7 +408,7 @@
 
 (macrolet ((foo (&rest specs)
              `(progn
-               ,@(loop for (type slot default) in specs
+               ,@(loop for (nil slot nil) in specs
                        for index from 0
                        collect
                        `(progn
@@ -426,7 +426,7 @@
                        (data +X-RenderChangePicture+)
                        (picture picture)
                        (mask
-                        ,@(loop for (type slot default) in specs
+                        ,@(loop for (type slot nil) in specs
                                 for index from 0
                                 collect
                                 `(,type (and
@@ -454,7 +454,7 @@
                    (drawable
                     &key format
                          (picture (make-picture :display (drawable-display drawable)))
-                         ,@(loop for (type slot default-value) in specs
+                         ,@(loop for (nil slot nil) in specs
                                  collect (cond ((eql slot 'clip-mask)
                                                 `(clip-mask :none))
                                                (t
@@ -475,7 +475,7 @@
                        (drawable drawable)
                        (picture-format format)
                        (mask
-                        ,@(loop for (type slot default) in specs
+                        ,@(loop for (type slot nil) in specs
                                 collect
                                 (cond ((eql slot 'clip-mask)
                                        (list type `(and
@@ -487,7 +487,7 @@
                      (%render-change-picture-clip-rectangles picture clip-mask))
                    (setf (picture-format picture) format)
                    (setf (picture-%server-values picture)
-                         (vector ,@(loop for (type slot default) in specs
+                         (vector ,@(loop for (nil slot default) in specs
                                          collect
                                          `(or ,slot ,default))))
                    (setf (picture-%values picture) (copy-seq (picture-%server-values picture)))