-tools-$(CONFIG_GCC_VERSION_4_3)$(CONFIG_GCC_VERSION_4_4) += gmp mpfr
-tools-y += m4 autoconf automake bison pkg-config sed
-tools-y += sstrip ipkg-utils genext2fs squashfs mtd-utils lzma mkimage
-tools-y += firmware-utils patch-cmdline quilt yaffs2
-
+ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
+tools-$(CONFIG_GCC_VERSION_4_3)$(CONFIG_GCC_VERSION_4_4)$(CONFIG_GCC_VERSION_4_5) += gmp mpfr
+tools-$(CONFIG_GCC_VERSION_4_5) += mpc libelf
+endif
+tools-y += m4 libtool autoconf automake flex bison pkg-config sed mklibs
+tools-y += sstrip ipkg-utils genext2fs e2fsprogs mtd-utils mkimage
+tools-y += firmware-utils patch-cmdline quilt yaffs2 flock
+tools-y += xorg-macros xz
+tools-$(CONFIG_TARGET_orion_generic) += wrt350nv2-builder upslug2
+tools-$(CONFIG_TARGET_x86) += qemu
+ifneq ($(CONFIG_TARGET_ar71xx),)
+tools-y += lzma-old squashfs
+endif
+tools-y += lzma squashfs4