fake:

package/powerpc/yaboot/cross-compile.patch

@@ -1,14 +1,3 @@
---- ./Makefile~	2006-03-16 19:26:56.000000000 +0100
-+++ ./Makefile	2006-03-16 19:36:00.000000000 +0100
-@@ -26,7 +26,7 @@
- # Set this to the prefix of your cross-compiler, if you have one.
- # Else leave it empty.
- #
--CROSS = 
-+CROSS = powerpc-unknown-linux-gnu-
- 
- # The flags for the yaboot binary.
- #
 --- yaboot-1.3.13/Makefile~	2006-03-16 19:38:24.000000000 +0100
 +++ yaboot-1.3.13/Makefile	2006-03-16 19:40:45.000000000 +0100
 @@ -172,10 +172,10 @@

package/powerpc/yaboot/yaboot.conf

@@ -39,5 +39,7 @@ yaboot_premake() {
 		# tell yaboot how to cross-compile
 		sed -i "s,^ROOT =,ROOT = $xroot," Makefile
 		sed -i "s,^CROSS =,CROSS = $archprefix," Makefile
+	else
+		sed -i "s,^ROOT =,ROOT = $root," Makefile
 	fi
 }