diff -Naur asterisk-addons-451.orig/Makefile asterisk-addons-451.patched-devmode/Makefile
--- asterisk-addons-451.orig/Makefile	2007-07-18 14:17:51.000000000 +0700
+++ asterisk-addons-451.patched-devmode/Makefile	2007-10-02 12:00:29.000000000 +0700
@@ -18,6 +18,10 @@
 
 CFLAGS+=-fPIC
 
+ifeq ($(AST_DEVMODE),yes)
+  CFLAGS+=-Werror -Wunused -Wundef $(AST_DECLARATION_AFTER_STATEMENT)
+endif
+
 # If the file .asteriskaddons.makeopts is present in your home directory, you can
 # include all of your favorite menuselect options so that every time you download
 # a new version of Asterisk-addons, you don't have to run menuselect to set them.
diff -Naur asterisk-addons-451.orig/configure.ac asterisk-addons-451.patched-devmode/configure.ac
--- asterisk-addons-451.orig/configure.ac	2007-06-04 09:36:42.000000000 +0700
+++ asterisk-addons-451.patched-devmode/configure.ac	2007-10-02 12:18:35.000000000 +0700
@@ -156,6 +156,15 @@
 
 AC_LANG(C)
 
+AC_ARG_ENABLE(dev-mode,
+        [  --enable-dev-mode    Turn on developer mode],
+        [case "${enableval}" in
+              y|ye|yes) AST_DEVMODE=yes ;;
+              n|no)  AST_DEVMODE=no ;;
+              *) AC_MSG_ERROR(bad value ${enableval} for --enable-dev-mode)  ;;
+        esac])
+AC_SUBST(AST_DEVMODE)
+
 # from here on down, library checking should be done in alphabetical order
 # by the --with option name, to make things easier for the users :-)
 
@@ -169,6 +178,17 @@
 AST_EXT_LIB_CHECK([CURSES], [curses], [initscr], [curses.h])
 AST_EXT_LIB_CHECK([NCURSES], [ncurses], [initscr], [curses.h])
 
+AC_MSG_CHECKING(for -Wdeclaration-after-statement support)
+if $(${CC} -Wdeclaration-after-statement -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
+        AC_MSG_RESULT(yes)
+        AST_DECLARATION_AFTER_STATEMENT=-Wdeclaration-after-statement
+else
+        AC_MSG_RESULT(no)
+        AST_DECLARATION_AFTER_STATEMENT=
+fi
+AC_SUBST(AST_DECLARATION_AFTER_STATEMENT)
+
+
 MYSQL_CONFIG=No
 PBX_MYSQLCLIENT=0
 if test "${USE_MYSQLCLIENT}" != "no"; then	
diff -Naur asterisk-addons-451.orig/makeopts.in asterisk-addons-451.patched-devmode/makeopts.in
--- asterisk-addons-451.orig/makeopts.in	2007-06-04 09:36:42.000000000 +0700
+++ asterisk-addons-451.patched-devmode/makeopts.in	2007-10-02 12:39:46.000000000 +0700
@@ -33,6 +33,9 @@
 sharedstatedir = @sharedstatedir@
 sysconfdir = @sysconfdir@
 
+AST_DEVMODE=@AST_DEVMODE@
+AST_DECLARATION_AFTER_STATEMENT=@AST_DECLARATION_AFTER_STATEMENT@
+
 BLUETOOTH_LIB=@BLUETOOTH_LIB@
 BLUETOOTH_INCLUDE=@BLUETOOTH_INCLUDE@