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TM4C1294NCPDT: LWIP Configuration issue, sys_mutex_t is undefined

Part Number: TM4C1294NCPDT

Tool/software:

I am trying to configure the lwip 1.4.1. I using the enet_static-ip_lwip_tcpecho server example. 
changes i made is I asserted the macros

#define NO SYS   1

#define LWIP_STATS 1
#define TCP_STATS (LWIP_TCP)
#define SYS_STATS 1

#define TCPIP_THREAD_STACKSIZE          1024


I included stats.h in the sysarch.h

the above modification were done in order to eliminate some compilation error.

But one error is pending is sys_mutex_t is undefined in sys.h

What to do?