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-rw-r--r--scd/apdu.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/scd/apdu.c b/scd/apdu.c
index d23a4adc9..212b9df24 100644
--- a/scd/apdu.c
+++ b/scd/apdu.c
@@ -20,6 +20,10 @@
* $Id$
*/
+/* NOTE: This module is also used by other software, thus the use of
+ the macro USE_GNU_PTH is mandatory. For GnuPG this macro is
+ guaranteed to be defined true. */
+
#include <config.h>
#include <errno.h>
#include <stdio.h>