Found the following significant warnings:
  libunrtf/attr.h:85:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.h:86:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.h:87:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.h:92:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.h:94:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.h:96:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.h:98:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:71:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:72:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:449:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:512:10: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:537:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:563:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:603:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:632:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/attr.c:663:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:165:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:222:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:223:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:237:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:257:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:379:30: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:391:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:3093:12: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:3114:11: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:3140:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:3164:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/convert.c:3245:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/error.c:67:7: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/hash.c:84:12: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/path.h:15:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/path.h:16:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/malloc.c:156:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/output.c:97:11: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/parse.c:216:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/path.c:70:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  libunrtf/path.c:103:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/unrtf.Rcheck/00install.out' for details.