@@ -1,7 +1,10 @@
 dnl Define ourselves
 AC_INIT(tcc4tcl, @@VERS@@)
+
+dnl Default prefix should be "UNSPECIFIED" to use magic in the Makefile
+ac_default_prefix="UNSPECIFIED"
 
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_CPP
 AC_PROG_MAKE_SET