Problems compiling: array type has incomplete element type

[Jim Schueler]

 Hello.
 
 I successfully built Cyrus imapd and got everything working, but when 
 I tried installing on my production machine and immediately 
 got this error:
 
 mapopts.h:181: error: array type has incomplete element type
 make[1]: *** [libconfig.o] Error 1
 make[1]: Leaving directory `/home/tqis/src/cyrus-imapd-2.2.12/lib'
 make: *** [all] Error 1
 
 here is the offending line of code:
 
   extern struct imapopt_s imapopts[];
 
 From what I've learned, gcc 4.0 now explicitly forbids this declaration, 
 terseley:
 
   Arrays are of object types only.  Incomplete types are not object types.
 
 Is there an easy fix for this problem?  Does the explanation make sense 
 to  anyone else?
 
  -Jim

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