Found the following significant warnings:
  ./glpkAPI.h:81:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:84:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:87:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:101:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:104:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:107:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:460:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:491:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:433:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:446:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:459:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:722:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:791:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:825:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  glpkAPI.c:3400:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./glpkAPI.h:491:6: warning: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C2x, conflicting with a subsequent definition [-Wdeprecated-non-prototype]
See ‘/data/gannet/ripley/R/packages/tests-clang/glpkAPI.Rcheck/00install.out’ for details.