curdir:=tools
# subdirectories to descend into
-$(curdir)/builddirs := sed sstrip ipkg-utils genext2fs squashfs mtd-utils lzma mkimage firmware-utils patch-cmdline pkg-config automake libtool $(if $(CONFIG_CCACHE),ccache)
+$(curdir)/builddirs := sed sstrip ipkg-utils genext2fs squashfs mtd-utils lzma mkimage firmware-utils patch-cmdline pkg-config automake $(if $(CONFIG_CCACHE),ccache) bison $(if $(CONFIG_powerpc),dtc)
# builddir dependencies
$(curdir)/squashfs/compile := $(curdir)/lzma/install