+dnl If the host is Windows, define _WIN32_WINNT to a suitable value.
+AC_CANONICAL_HOST
+case $host in
+ *mingw*|*cygwin*|*win32*) CFLAGS="$CFLAGS -D_WIN32_WINNT=0x0500" ;;
+esac
+
+dnl Check support for 64 bit file offsets.
+AC_SYS_LARGEFILE
+
+dnl Check if dirent (readdir) supports d_type member.
+AC_STRUCT_DIRENT_D_TYPE
+
+dnl Check if stat has the required fields.
+AC_STRUCT_ST_BLOCKS
+AC_CHECK_MEMBER([struct stat.st_blksize],[
+ AC_DEFINE([HAVE_STRUCT_STAT_ST_BLKSIZE],[1],[Define to 1 if 'st_blksize' is a member of 'struct stat'])])
+
+dnl Check for gperf.
+AC_CHECK_PROG([GPERF],[gperf],[gperf],[no])
+test "x$GPERF" = "xno" &&
+ AC_MSG_ERROR([gperf must be installed])
+