Found the following significant warnings:
  ../inst/include/wk-v1.h:101:32: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ../inst/include/wk-v1.h:106:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  bbox-handler.c:148:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  bbox-handler.c:280:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  count-handler.c:143:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:8:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:9:38: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:10:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:24:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:25:41: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:26:38: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:27:32: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:35:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:40:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  meta-handler.c:171:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  meta-handler.c:223:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  problems-handler.c:92:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sfc-writer.c:58:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sfc-writer.c:119:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  sfc-writer.c:914:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  void-handler.c:7:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ../inst/include/wk-v1-impl.c:50:32: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ../inst/include/wk-v1-impl.c:148:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  wkb-writer.c:31:55: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  xy-writer.c:239:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-clang/wk.Rcheck/00install.out’ for details.