Patches to make gdbm compile on MinGW/MSYS

fsync-emulation.patch

diff --git a/src/systems.h b/src/systems.h
index c83cd9c..f194318 100644
--- a/src/systems.h
+++ b/src/systems.h
@@ -70,6 +70,13 @@
 # define STDERR_FILENO 2
 #endif
 
+/* fsync emulation for MinGW */
+#ifdef __MINGW32__
+#include <windows.h>
+#define HAVE_FSYNC 1
+#define fsync(fd) (FlushFileBuffers ((HANDLE) _get_osfhandle(fd)) ? 0 : -1)
+#endif
+
 /* I/O macros. */
 #if HAVE_MMAP
 # define __read(_dbf, _buf, _size)  _gdbm_mapped_read(_dbf, _buf, _size)

testgdbm.patch

diff --git a/src/testgdbm.c b/src/testgdbm.c
index b2b9c6c..eb85f74 100644
--- a/src/testgdbm.c
+++ b/src/testgdbm.c
@@ -27,7 +27,9 @@
 #include <errno.h>
 #include <ctype.h>
 #include <signal.h>
-#include <sys/ioctl.h>
+#ifndef __MINGW32__
+#  include <sys/ioctl.h>
+#endif
 #ifdef HAVE_SYS_TERMIOS_H
 # include <sys/termios.h>
 #endif
@@ -326,7 +328,7 @@ read_from_file (const char *name, int replace)
 int
 get_screen_lines ()
 {
-#ifdef TIOCGWINSZ
+#if defined(TIOCGWINSZ) && !defined(__MINGW32__)
   if (isatty (1))
     {
       struct winsize ws;
@@ -1126,7 +1128,9 @@ main (int argc, char *argv[])
       -1)
     error (2, _("gdbm_setopt failed: %s"), gdbm_strerror (gdbm_errno));
 
+#ifndef __MINGW32__
   signal (SIGPIPE, SIG_IGN);
+#endif
 
   /* Welcome message. */
   if (interactive)

winsock-configure.patch

diff --git a/configure.ac b/configure.ac
index 421e230..24b0f57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -97,6 +97,19 @@ AC_CHECK_LIB(dbm, main)
 AC_CHECK_LIB(ndbm, main)
 AC_CHECK_FUNCS([rename ftruncate flock lockf fsync setlocale])
 
+AC_SEARCH_LIBS([gethostbyname], [nsl socket], [], [
+dnl Can't search ws2_32 for gethostbyname using AC_SEARCH_LIBS, because
+dnl it requires #include <winsocks2.h> to work.
+my_old_LIBS=$LIBS
+LIBS="-lws2_32 $LIBS"
+ws2_res=yes
+AC_MSG_CHECKING([for gethostbyname in ws2_32])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <winsock2.h>]],
+                                [[gethostbyname ("");]])],
+               [], [LIBS=$my_ac_save_LIBS ws2_res=no])
+AC_MSG_RESULT([$ws2_res])
+])
+
 if test x$mapped_io = xyes
 then
   AC_FUNC_MMAP()

winsock.patch

diff --git a/src/flatfile.c b/src/flatfile.c
index c0f9422..c762438 100644
--- a/src/flatfile.c
+++ b/src/flatfile.c
@@ -20,7 +20,11 @@
 
 /* Include system configuration before all else. */
 # include "autoconf.h"
+# ifdef __MINGW32__
+# include <winsock.h>
+# else
 # include <arpa/inet.h>
+# endif
 
 # include "gdbmdefs.h"
 # include "gdbm.h"