Found the following significant warnings:
  ./fansi.h:190:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  assumptions.c:31:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  assumptions.c:45:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:66:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:72:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:73:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:74:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:75:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:76:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:87:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:98:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:99:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:100:36: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:101:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./fansi-ext.h:103:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  utils.c:59:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  utils.c:70:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  utils.c:177:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  utils.c:180:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  utils.c:183:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  utils.c:186:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  write.c:323:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  write.c:370:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  write.c:377:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  write.c:386:36: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  write.c:395:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-clang/fansi.Rcheck/00install.out’ for details.
* used C compiler: ‘clang version 15.0.6’