diff -urpN blt2.4z-8.5.2.orig/configure.in blt2.4z-8.5.2/configure.in
--- blt2.4z-8.5.2.orig/configure.in	2013-12-31 09:48:06.356979323 -0800
+++ blt2.4z-8.5.2/configure.in	2013-12-31 09:49:33.269046697 -0800
@@ -1419,9 +1433,14 @@ echo ""
 #	   ./demos/Makefile
 #
 #--------------------------------------------------------------------
-src_Makefile="src/Makefile"
+SRC_MAKEFILE="src/Makefile"
 if test "${blt_platform}" = "win"; then
-    src_Makefile="src/Makefile:src/Makefile-cyg.in"
+    SRC_MAKEFILE="src/Makefile:src/Makefile-cyg.in"
 fi
-AC_OUTPUT(Makefile ${src_Makefile} src/bltHash.h src/shared/Makefile man/Makefile library/Makefile demos/Makefile)
+
+AC_SUBST([SRC_MAKEFILE])
+AC_CONFIG_FILES([${SRC_MAKEFILE}], , [SRC_MAKEFILE=$SRC_MAKEFILE])
+AC_CONFIG_FILES([Makefile src/bltHash.h src/shared/Makefile man/Makefile library/Makefile demos/Makefile])
+
+AC_OUTPUT