Buiding on openSUSE Build Service, implicit decl errors

Hi
Building fails rpm build checks with the following errors;

I: Program is using implicit definitions of functions getting
   pointers or implemented by macros. These functions need to use their
   correct prototypes to allow correct argument passing on e.g. x86_64 .
     - Implicit memory/string functions need #include <string.h>.
     - Implicit *printf functions need #include <stdio.h>.
     - Implicit *printf functions need #include <stdio.h>.
     - Implicit *read* functions need #include <unistd.h>.
     - Implicit *recv* functions need #include <sys/socket.h>.
W: xorg-input-wizardpen implicit-pointer-decl calibrate/wizardpen-calibrate.c:61

I: Program is using implicit definitions of special functions.
   these functions need to use their correct prototypes to allow
   the lightweight buffer overflow checking to work.
     - Implicit memory/string functions need #include <string.h>.
     - Implicit *printf functions need #include <stdio.h>.
     - Implicit *printf functions need #include <stdio.h>.
     - Implicit *read* functions need #include <unistd.h>.
     - Implicit *recv* functions need #include <sys/socket.h>.
E: xorg-input-wizardpen implicit-fortify-decl calibrate/wizardpen-calibrate.c:74

The attached patch corrects the error.