Under cygwin, winsock2.h is intentionally incompatible with, <sys/socket.h>, and checking for existence is wrong. Under mingw, HAVE_WINSOCK2_H is defined on our behalf by gnulib, in a way that does not interfere with cygwin. * configure.ac: Drop unnecessary header check. Reported by Matthias Bolte. ---  configure.ac |    3 ++-  1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/configure.ac b/configure.ac index 99bc906..deaa697 100644 --- a/configure.ac +++ b/configure.ac @@ -112,7 +112,8 @@ dnl Availability of various not common threadsafe functions  AC_CHECK_FUNCS([strerror_r strtok_r getmntent_r getgrnam_r getpwuid_r])  dnl Availability of various common headers (non-fatal if missing). -AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h sys/wait.h winsock2.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h]) +AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h +  sys/wait.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h])  dnl Where are the XDR functions?  dnl If portablexdr is installed, prefer that. -- 1.6.6.1

On 04/23/2010 11:02 AM, Matthias Bolte wrote: >> * configure.ac: Drop unnecessary header check. >> Reported by Matthias Bolte. >> --- >> -AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h sys/wait.h winsock2.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h]) >> +AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h >> + sys/wait.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h]) >> >> dnl Where are the XDR functions? >> dnl If portablexdr is installed, prefer that. >> -- >> 1.6.6.1 >> > > ACK. Thanks; pushed.