[cups] Build Error

[nanook at eskimo.com]

     I am trying to build cups 2.3.0 under Ubuntu 19.10 but the compile is
failing with the following error:

ipp.c: In function ‘main’:
ipp.c:236:10: error: variable ‘waittime’ set but not used
[-Werror=unused-but-se
t-variable]
  236 |   time_t waittime;  /* Wait time for held jobs */
      |          ^~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [../Makedefs:271: ipp.o] Error 1
make: *** [Makefile:42: all] Error 1