source: https://dev.openwrt.org/browser/trunk/openwrt/package/dropbear/patches/scp-argument-fix.patch?rev=453
comment: remove unsupported default arguments in scp.  Fixes OE bug 3227.

diff -ur dropbear-0.49-orig/scp.c dropbear-0.49/scp.c
--- dropbear-0.49-orig/scp.c	2007-02-22 16:51:35.000000000 +0100
+++ dropbear-0.49/scp.c	2007-10-19 14:19:08.000000000 +0200
@@ -308,10 +308,10 @@
 	memset(&args, '\0', sizeof(args));
 	args.list = NULL;
 	addargs(&args, "%s", ssh_program);
-	addargs(&args, "-x");
-	addargs(&args, "-oForwardAgent no");
-	addargs(&args, "-oPermitLocalCommand no");
-	addargs(&args, "-oClearAllForwardings yes");
+//	addargs(&args, "-x");
+//	addargs(&args, "-oForwardAgent no");
+//	addargs(&args, "-oPermitLocalCommand no");
+//	addargs(&args, "-oClearAllForwardings yes");
 
 	fflag = tflag = 0;
 	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)