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-rw-r--r--configure.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.in b/configure.in
index 2d7b695fd6..3b59383101 100644
--- a/configure.in
+++ b/configure.in
@@ -20,7 +20,7 @@ VERSION=2.3
AC_SUBST(SOVERSION)
SOVERSION=1.0
-AC_DEFINE(_XOPEN_SOURCE, 500)
+AC_DEFINE(_XOPEN_SOURCE, 500, [Needed on Tru64 and does no harm on Linux])
# Arguments passed to configure.
AC_SUBST(CONFIG_ARGS)