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diff --git a/configure.ac b/configure.ac
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index dcb8aa0..7d7ab76 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -796,7 +796,7 @@ fi
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AC_SUBST(SOCAT_USE_COMPRESS)
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-if man --help | grep -q -e --warnings
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+if man --help |& grep -q -e --warnings
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then
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MAN_HAS_WARNINGS=1
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else
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