diff -up ./src/ccid_ifdhandler.h.readers_32 ./src/ccid_ifdhandler.h

--- ./src/ccid_ifdhandler.h.readers_32	2018-08-20 16:06:34.080905748 -0700

+++ ./src/ccid_ifdhandler.h	2018-08-20 16:07:04.638097096 -0700

@@ -47,7 +47,7 @@ extern int DriverOptions;

  * The maximum number of readers is also limited in pcsc-lite (16 by default)

  * see the definition of PCSCLITE_MAX_READERS_CONTEXTS in src/PCSC/pcsclite.h

  */

-#define CCID_DRIVER_MAX_READERS 16

+#define CCID_DRIVER_MAX_READERS 32

 /*

  * CCID driver specific functions