Typo + #include <fcntl.h>#2
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Without #include <fcntl.h> I get errors like:
```
Code.c: In function ‘main’:
Code.c:31:2: warning: implicit declaration of function ‘write’ [-Wimplicit-function-declaration]
write(file, config, 2);
^~~~~
Code.c:42:2: warning: implicit declaration of function ‘sleep’ [-Wimplicit-function-declaration]
sleep(1);
^~~~~
Code.c:49:5: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration]
if(read(file, data, 6) != 6)
^~~~
gcc -Wall Code.c -o Code -lwiringPi
Code.c: In function ‘main’:
Code.c:31:2: warning: implicit declaration of function ‘write’ [-Wimplicit-function-declaration]
write(file, config, 2);
^~~~~
Code.c:42:2: warning: implicit declaration of function ‘sleep’ [-Wimplicit-function-declaration]
sleep(1);
^~~~~
Code.c:49:5: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration]
if(read(file, data, 6) != 6)
```
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Without #include <fcntl.h> I get errors like: