View Compilation Error

0_0_3207280_21968.cpp:2:18: stdlib.: No such file or directory
0_0_3207280_21968.cpp: In function `int main()':
0_0_3207280_21968.cpp:12: error: `qsort' undeclared (first use this function)
0_0_3207280_21968.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)