Found the following significant warnings:
  ./topmodel.h:10:12: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:12:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:13:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:14:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:16:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:18:12: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:19:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:21:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:23:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:25:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:26:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./topmodel.h:16:8: 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]
  c_infiltration.c:17:27: warning: passing arguments to 'get_f' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  c_topmodel.c:20:13: warning: passing arguments to 'topidx_calc' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  c_topmodel.c:21:19: warning: passing arguments to 'memory_allocation' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  c_topmodel.c:35:13: warning: passing arguments to 'param_init' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  c_topmodel.c:40:16: warning: passing arguments to 'run_topmodel' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  c_topmodel.c:44:9: warning: passing arguments to 'output' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  c_topmodel.c:49:13: warning: passing arguments to 'memory_free' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./topmodel.h:25:6: 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]
  core_topmodel.c:25:32: warning: passing arguments to 'get_f' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./topmodel.h:23:8: 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]
  ./topmodel.h:19:8: 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]
  ./topmodel.h:18:6: 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]
  ./topmodel.h:10:6: 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]
  output.c:45:22: warning: passing arguments to 'get_Eff' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./topmodel.h:21:6: 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]
  param_init.c:28:26: warning: passing arguments to 'get_lambda' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  param_init.c:45:8: warning: passing arguments to 'get_Ad' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./topmodel.h:14:6: 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]
  ./topmodel.h:12:6: 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]
  ./topmodel.h:13:6: 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 '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/topmodel.Rcheck/00install.out' for details.