View Compilation Error

0_0_1539360_20669.cpp: In function `int comp(const void*, const void*)':
0_0_1539360_20669.cpp:35: error: `strcmp' undeclared (first use this function)
0_0_1539360_20669.cpp:35: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1539360_20669.cpp: In function `int main()':
0_0_1539360_20669.cpp:52: error: `strcmp' undeclared (first use this function)