View Compilation Error

0_0_11094185_4750.cpp:1:18: reg51.h: No such file or directory
0_0_11094185_4750.cpp:2:19: global.h: No such file or directory
0_0_11094185_4750.cpp:3:36: ks0066.h: No such file or directory
0_0_11094185_4750.cpp: In function `int main()':
0_0_11094185_4750.cpp:5: error: `lcd_init' undeclared (first use this function)
0_0_11094185_4750.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11094185_4750.cpp:7: error: `print_string' undeclared (first use this function)
0_0_11094185_4750.cpp:8: error: `write_com' undeclared (first use this function)