Found the following significant warnings:
  standalone.c:155:273: warning: format '%ld' expects argument of type 'long int', but argument 16 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:3771:48: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4117:27: warning: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4419:76: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4500:31: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4784:49: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4804:84: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4816:51: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4844:72: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  Rserv.c:4850:83: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  qap_encode.c:142:17: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  websockets.c:467:68: warning: format '%ld' expects argument of type 'long int', but argument 6 has type 'long long int' [-Wformat=]
  websockets.c:497:89: warning: format '%ld' expects argument of type 'long int', but argument 6 has type 'long long int' [-Wformat=]
  websockets.c:563:101: warning: format '%ld' expects argument of type 'long int', but argument 6 has type 'rlen_t' {aka 'long long int'} [-Wformat=]
  websockets.c:777:64: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'long long int' [-Wformat=]
See 'd:/Rcompile/CRANpkg/local/4.3/Rserve.Rcheck/00install.out' for details.