Index: kernel/arch/ppc32/Makefile.inc
===================================================================
--- kernel/arch/ppc32/Makefile.inc	(revision 46d8eb9b258c351fc7a0ec7a45162776b8adc3a2)
+++ kernel/arch/ppc32/Makefile.inc	(revision 82b72e401e53bd1d38280c3f1cc11cc0e83fbae4)
@@ -30,9 +30,13 @@
 #
 
+ifndef CROSS_PREFIX
+	CROSS_PREFIX = /usr/local
+endif
+
 BFD_NAME = elf32-powerpc
 BFD_ARCH = powerpc:common
 BFD = binary
 TARGET = ppc-linux-gnu
-TOOLCHAIN_DIR = /usr/local/ppc
+TOOLCHAIN_DIR = $(CROSS_PREFIX)/ppc
 
 GCC_CFLAGS += -mcpu=powerpc -msoft-float -m32