Found the following significant warnings:
  px.c:14:11: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:52:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:53:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:54:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:55:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:56:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:57:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:58:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:59:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:62:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:63:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps.h:74:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps-internal.h:65:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps-internal.h:66:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps-internal.h:67:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps-internal.h:68:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps-internal.h:82:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./ps-internal.h:83:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./common.h:21:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-common.c:24:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  common.c:21:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  extra.c:90:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  extra.c:108:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  dummy.c:10:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  dummy.c:22:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  error-codes.c:6:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  posix.c:181:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  posix.c:191:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  posix.c:225:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  posix.c:360:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  posix.c:510:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-posix.c:98:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  linux.c:82:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:257:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:804:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:814:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:822:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:1212:15: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:1312:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:1318:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  api-linux.c:1323:26: 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/ps.Rcheck/00install.out' for details.