Hi Bruno, 

Thanks for your reply. Sorry, now the output with correct line breaks.
For the following test command I got the below noted output on mingw-
w64 with latest gnulib from git repository.

./gnulib-tool --create-testdir --dir=/tmp/testdir poll poll-tests poll-
h poll-h-tests
cd /tmp/testdir
./configure && make




Result for i686:

In file included from poll.c:39:
C:/Users/hm/Documents/msys32/mingw32/i686-w64-
mingw32/include/winsock2.h:1155:16: error: redefinition of 'struct
pollfd'
 1155 | typedef struct pollfd {
      |                ^~~~~~
In file included from poll.c:32:
./poll.h:506:8: note: originally defined here
  506 | struct pollfd
      |        ^~~~~~
poll.c:345:1: error: conflicting types for 'poll'
  345 | poll (struct pollfd *pfd, nfds_t nfd, int timeout)
      | ^~~~
In file included from poll.c:32:
./poll.h:536:1: note: previous declaration of 'poll' was here
  536 | _GL_FUNCDECL_SYS (poll, int, (struct pollfd *pfd, nfds_t nfd,
int timeout));
      | ^~~~~~~~~~~~~~~~
make[4]: *** [Makefile:1459: poll.o] Fehler 1
make[4]: Verzeichnis „/tmp/testdir/gllib“ wird verlassen
make[3]: *** [Makefile:1481: all-recursive] Fehler 1
make[3]: Verzeichnis „/tmp/testdir/gllib“ wird verlassen
make[2]: *** [Makefile:1318: all] Fehler 2
make[2]: Verzeichnis „/tmp/testdir/gllib“ wird verlassen
make[1]: *** [Makefile:1220: all-recursive] Fehler 1
make[1]: Verzeichnis „/tmp/testdir“ wird verlassen
make: *** [Makefile:1161: all] Fehler 2

Result for x86_64:


In file included from poll.c:39:
C:/Users/hm/Documents/msys32/mingw64/x86_64-w64-
mingw32/include/winsock2.h:1155:16: error: redefinition of 'struct
pollfd'
 1155 | typedef struct pollfd {
      |                ^~~~~~
In file included from poll.c:32:
./poll.h:506:8: note: originally defined here
  506 | struct pollfd
      |        ^~~~~~
poll.c:345:1: error: conflicting types for 'poll'
  345 | poll (struct pollfd *pfd, nfds_t nfd, int timeout)
      | ^~~~
In file included from poll.c:32:
./poll.h:536:1: note: previous declaration of 'poll' was here
  536 | _GL_FUNCDECL_SYS (poll, int, (struct pollfd *pfd, nfds_t nfd,
int timeout));
      | ^~~~~~~~~~~~~~~~
poll.c: In function 'poll':
poll.c:519:39: warning: passing argument 5 of 'select' from
incompatible pointer type [-Wincompatible-pointer-types]
  519 |   if (select (0, &rfds, &wfds, &xfds, &tv0) > 0)
      |                                       ^~~~
      |                                       |
      |                                       struct rpl_timeval *
In file included from poll.c:39:
C:/Users/hm/Documents/msys32/mingw64/x86_64-w64-
mingw32/include/winsock2.h:995:116: note: expected 'PTIMEVAL' {aka
'struct timeval * const'} but argument is of type 'struct rpl_timeval
*'
  995 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set
*readfds,fd_set *writefds,fd_set *exceptfds,const PTIMEVAL timeout);
      |                                                                
                                     ~~~~~~~~~~~~~~~^~~~~~~
poll.c:555:37: warning: passing argument 5 of 'select' from
incompatible pointer type [-Wincompatible-pointer-types]
  555 |     select (0, &rfds, &wfds, &xfds, &tv0);
      |                                     ^~~~
      |                                     |
      |                                     struct rpl_timeval *
In file included from poll.c:39:
C:/Users/hm/Documents/msys32/mingw64/x86_64-w64-
mingw32/include/winsock2.h:995:116: note: expected 'PTIMEVAL' {aka
'struct timeval * const'} but argument is of type 'struct rpl_timeval
*'
  995 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set
*readfds,fd_set *writefds,fd_set *exceptfds,const PTIMEVAL timeout);
      |                                                                
                                     ~~~~~~~~~~~~~~~^~~~~~~
make[4]: *** [Makefile:1459: poll.o] Fehler 1
make[4]: Verzeichnis „/tmp/testdir-64/gllib“ wird verlassen
make[3]: *** [Makefile:1481: all-recursive] Fehler 1
make[3]: Verzeichnis „/tmp/testdir-64/gllib“ wird verlassen
make[2]: *** [Makefile:1318: all] Fehler 2
make[2]: Verzeichnis „/tmp/testdir-64/gllib“ wird verlassen
make[1]: *** [Makefile:1221: all-recursive] Fehler 1
make[1]: Verzeichnis „/tmp/testdir-64“ wird verlassen
make: *** [Makefile:1162: all] Fehler 2