-${GNUMAKE:-gmake} clean || exit 1
-${GNUMAKE:-gmake} depend || exit 1
-${GNUMAKE:-gmake} all || exit 1
+$gnumake clean || exit 1
+$gnumake depend || exit 1
+$gnumake all || exit 1
+cd ../..
+
+# Use a little C program to grab stuff from the C header files and
+# smash it into Lisp source code.
+cd tools-for-build
+$gnumake grovel_headers
+cd ..
+tools-for-build/grovel_headers > output/stuff-groveled-from-headers.lisp