--- configure.ac.orig	2011-05-14 21:13:46.000000000 -0500
+++ configure.ac	2013-02-12 01:47:15.000000000 -0600
@@ -1,6 +1,6 @@
 AC_PREREQ(2.59)
 AC_INIT(uni2ascii, 4.18, billposer@alum.mit.edu)
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS([config.h])
 AM_INIT_AUTOMAKE
 
 AC_ARG_ENABLE(newsummary,
@@ -26,9 +26,9 @@
 # Checks for programs.
 AC_PROG_CC
 if ${debugbuild}; then
-   CFLAGS="-ggdb -g3" 
+   CFLAGS+=" -ggdb -g3" 
 else
-   CFLAGS="-g -O2" 
+   CFLAGS+=" -g" 
 fi
 
 AC_PROG_INSTALL