diff --git a/ccid/src/ccid.c b/ccid/src/ccid.c
index f49cd5f..40d1a37 100644
--- a/ccid/src/ccid.c
+++ b/ccid/src/ccid.c
@@ -20,6 +20,7 @@
 #include <libopensc/log.h>
 #include <libopensc/opensc.h>
 #include <libopensc/reader-boxing.h>
+#include <libopensc/sm.h>
 #include <sm/sm-eac.h>
 #include <openssl/evp.h>
 #include <stdarg.h>
diff --git a/ccid/src/scutil.c b/ccid/src/scutil.c
index 05cec74..7fb9d07 100644
--- a/ccid/src/scutil.c
+++ b/ccid/src/scutil.c
@@ -38,7 +38,7 @@ int sc_mutex_unlock(const sc_context_t *ctx, void *mutex) {}
 
 #if !defined(HAVE_SC_APDU_GET_OCTETS) || !defined(HAVE_SC_APDU_SET_RESP)
 #ifdef HAVE__SC_MATCH_ATR
-size_t sc_get_max_send_size(const sc_card_t *card) {}
+size_t sc_get_max_send_size(const sc_card_t *card) {return 0;}
 #endif
 #include "libopensc/apdu.c"
 #endif
diff --git a/ccid/src/usb.c b/ccid/src/usb.c
index aa7d8d4..c344d76 100644
--- a/ccid/src/usb.c
+++ b/ccid/src/usb.c
@@ -46,6 +46,7 @@
 #include "ccid.h"
 #include "cmdline.h"
 #include "config.h"
+#include "scutil.h"
 #include "usbstring.h"
 
 #define DRIVER_VENDOR_NUM	0x0D46		/* KOBIL Systems */