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