View Compilation Error

0_0_3004377_28735.cpp:1:20: ourhdr.h: No such file or directory
0_0_3004377_28735.cpp: In function `int main()':
0_0_3004377_28735.cpp:7: error: `STDIN_FILENO' undeclared (first use this function)
0_0_3004377_28735.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3004377_28735.cpp:7: error: `read' undeclared (first use this function)
0_0_3004377_28735.cpp:8: error: `STDOUT_FILENO' undeclared (first use this function)
0_0_3004377_28735.cpp:8: error: `write' undeclared (first use this function)
0_0_3004377_28735.cpp:9: error: `err_sys' undeclared (first use this function)
0_0_3004377_28735.cpp:13: error: `exit' undeclared (first use this function)