Mine

Index: packages/libs/speex/Makefile
===================================================================
--- packages/libs/speex/Makefile        (revision 7349)
+++ packages/libs/speex/Makefile        (working copy)
@@ -20,6 +20,8 @@
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
 PKG_INSTALL_DIR:=$(PKG_BUILD_DIR)/ipkg-install
 
+PKG_BUILD_DEPENDS:=libnotimpl
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/libspeex