Guard tinycrypt files with MBEDTLS_USE_UECC
diff --git a/tinycrypt/ecc.c b/tinycrypt/ecc.c
index b398c94..c4a6770 100644
--- a/tinycrypt/ecc.c
+++ b/tinycrypt/ecc.c
@@ -52,6 +52,7 @@
  *  POSSIBILITY OF SUCH DAMAGE.
  */
 
+#if defined(MBEDTLS_USE_UECC)
 #include <tinycrypt/ecc.h>
 #include <string.h>
 
@@ -937,5 +938,5 @@
 	return 1;
 }
 
-
+#endif /* MBEDTLS_USE_UECC */