Patch #628898: Define _XOPEN_SOURCE_EXTENDED and _POSIX_C_SOURCE.
diff --git a/configure.in b/configure.in
index 002666d..a3b726c 100644
--- a/configure.in
+++ b/configure.in
@@ -33,6 +33,13 @@
#endif])
AC_DEFINE(_XOPEN_SOURCE, 500)
+# On Tru64 Unix 4.0F, defining _XOPEN_SOURCE also requires definition
+# of _XOPEN_SOURCE_EXTENDED and _POSIX_C_SOURCE, or else several APIs
+# are not declared. Since this is also needed in some cases for HP-UX,
+# we define it globally.
+AC_DEFINE(_XOPEN_SOURCE_EXTENDED, 1, Define to activate Unix95-and-earlier features)
+AC_DEFINE(_POSIX_C_SOURCE, 199506L, Define to activate features from IEEE Stds 1003.{123}-1995)
+
# Arguments passed to configure.
AC_SUBST(CONFIG_ARGS)
CONFIG_ARGS="$ac_configure_args"