View Compilation Error

0_0_2466768_23028.cpp: In function `void compare(dnode*)':
0_0_2466768_23028.cpp:44: error: `strcmp' undeclared (first use this function)
0_0_2466768_23028.cpp:44: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2466768_23028.cpp: At global scope:
0_0_2466768_23028.cpp:74: error: `main' must return `int'