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-rw-r--r--doc/install.texi2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/install.texi b/doc/install.texi
index f4c8c4caaa..d498639ff8 100644
--- a/doc/install.texi
+++ b/doc/install.texi
@@ -188,7 +188,7 @@ not installed, it is recommended to use the following options in order to
use an ANSI C compiler:
@example
-./configure CC="cc -Ae"
+./configure CC="cc -Ae -D_XOPEN_SOURCE=500"
@end example
@noindent