Found the following significant warnings:
  settings.h:60:10: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringr.h:50:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringr.h:51:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringr.h:52:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringr.h:53:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringr.h:54:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  alike.h:189:10: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  alike.h:225:10: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  alike.c:53:27: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  alike.c:77:19: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  all-bw.c:25:13: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  assumptions.c:33:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringrtest.c:28:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringrtest.c:35:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringrtest.c:42:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringrtest.c:51:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  cstringrtest.c:65:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  validate.h:92:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  validate.h:94:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  validate.h:130:3: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  recurse.c:82:25: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  settings.c:26:22: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-devel/vetr.Rcheck/00install.out’ for details.
* used C compiler: ‘gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4)’