Found the following significant warnings:
  ../inst/include/wk-v1.h:101:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  ../inst/include/wk-v1.h:106:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  bbox-handler.c:148:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  bbox-handler.c:280:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  count-handler.c:143:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:8:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:9:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:10:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:24:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:25:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:26:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:27:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:35:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  init.c:40:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  meta-handler.c:171:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  meta-handler.c:223:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  problems-handler.c:92:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  sfc-writer.c:58:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  sfc-writer.c:119:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  sfc-writer.c:914:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  void-handler.c:7:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  ../inst/include/wk-v1-impl.c:50:15: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  ../inst/include/wk-v1-impl.c:148:13: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  wkb-writer.c:31:29: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  xy-writer.c:239:6: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-devel/wk.Rcheck/00install.out’ for details.