Found the following significant warnings:
  htree.c:126:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:135:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:324:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:362:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:408:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:517:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:693:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:711:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:813:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1476:36: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1494:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1528:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1679:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1754:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1839:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1869:32: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:1909:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:2906:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  htree.c:3696:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:13:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-clang/htree.Rcheck/00install.out’ for details.
* used C compiler: ‘clang version 16.0.0’