Why is gl_GC_RANDOM not found?

[Bruce Korb]

 $ autoreconf --symlink --install
configure.ac:47: error: possibly undefined macro: gl_GC_RANDOM
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1
 $ fgrep gl_GC_RANDOM $(find gnulib/m4 libopts/m4 m4 -name '*.m4')
gnulib/m4/gc-random.m4:AC_DEFUN([gl_GC_RANDOM],