diff -up sudo-1.7.2p1/configure.in.envdebug sudo-1.7.2p1/configure.in
--- sudo-1.7.2p1/configure.ac.envdebug	2009-10-30 12:18:09.000000000 +0100
+++ sudo-1.7.2p1/configure.ac	2009-10-30 12:19:01.000000000 +0100
@@ -1214,7 +1214,7 @@ AC_ARG_ENABLE(env_debug,
 [AS_HELP_STRING([--enable-env-debug], [Whether to enable environment debugging.])],
 [ case "$enableval" in
     yes)	AC_MSG_RESULT(yes)
-		AC_DEFINE(ENV_DEBUG)
+		AC_DEFINE(ENV_DEBUG, [], [Environment debugging.])
 		;;
     no)		AC_MSG_RESULT(no)
 		;;