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-rw-r--r--apps/kdf.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/apps/kdf.c b/apps/kdf.c
index 0b577b2bcd..9a69682b57 100644
--- a/apps/kdf.c
+++ b/apps/kdf.c
@@ -17,6 +17,8 @@
#include <openssl/kdf.h>
#include <openssl/params.h>
+DEFINE_STACK_OF_STRING()
+
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_KDFOPT, OPT_BIN, OPT_KEYLEN, OPT_OUT,