This patch is courtesy of OpenEmbedded, by Khem Raj <raj.khem@gmail.com>

http://cgit.openembedded.org/cgit.cgi/openembedded/commit/?id=b85b779688f0abc389e3c25d06b54de8b86385c1

Index: ltrace-0.5.3/sysdeps/linux-gnu/mipsel/trace.c
===================================================================
--- ltrace-0.5.3.orig/sysdeps/linux-gnu/mipsel/trace.c	2009-10-23 23:15:59.822783128 -0700
+++ ltrace-0.5.3/sysdeps/linux-gnu/mipsel/trace.c	2009-10-23 23:16:10.441268788 -0700
@@ -127,7 +127,6 @@ gimme_arg(enum tof type, Process *proc, 
 			return ret;
 		} else {
 			// If we need this, I think we can look at [sp+16] for arg_num==4.
-			CP;
 			return 0;
 		}
 	}