[PR PATCH] [Closed]: Add #include <unistd.h> to provide prototype for getopt()

[github at samba.org]

There's a closed pull request on the Samba Samba Github repository

Add #include <unistd.h> to provide prototype for getopt()
https://github.com/samba-team/samba/pull/116
Description: Fixes warning when building crackcheck:

~~~
# make
gcc  -O2   -c -o crackcheck.o crackcheck.c
crackcheck.c: In function ‘main’:
crackcheck.c:91:15: warning: implicit declaration of function ‘getopt’ [-Wimplicit-function-declaratio
  while ( (c = getopt(argc, argv, "d:cs")) != EOF){
               ^
~~~