Found the following significant warnings:
  /data/gannet/ripley/R/test-clang/libgeos/include/libgeos.h:46:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/libgeos/include/libgeos.h:434:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/wk/include/wk-v1.h:101:32: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/wk/include/wk-v1.h:106:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:179:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:181:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:182:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:183:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:380:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:394:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  init.c:401:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/libgeos/include/libgeos.c:8:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/libgeos/include/libgeos.c:262:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/libgeos/include/libgeos.c:263:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/wk/include/wk-v1-impl.c:50:32: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  /data/gannet/ripley/R/test-clang/wk/include/wk-v1-impl.c:148:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See ‘/data/gannet/ripley/R/packages/tests-clang/geos.Rcheck/00install.out’ for details.