# http://dovecot.org/list/dovecot/2010-October/054187.html

--- dovecot-2.0.6/configure.in.orig	2010-10-22 15:19:28.468473082 +0100
+++ dovecot-2.0.6/configure.in	2010-10-22 15:25:47.913411076 +0100
@@ -273,7 +273,7 @@
   sys/quota.h sys/fs/ufs_quota.h ufs/ufs/quota.h jfs/quota.h sys/fs/quota_common.h \
   mntent.h sys/mnttab.h sys/event.h sys/time.h sys/mkdev.h linux/dqblk_xfs.h \
   xfs/xqm.h execinfo.h ucontext.h malloc_np.h sys/utsname.h sys/vmount.h \
-  sys/utsname.h glob.h linux/falloc.h)
+  sys/utsname.h glob.h sys/types.h linux/falloc.h)
 
 dnl * gcc specific options
 if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
@@ -369,7 +369,7 @@
 	       setrlimit setproctitle seteuid setreuid setegid setresgid \
 	       strtoull strtoll strtouq strtoq \
 	       setpriority quotactl getmntent kqueue kevent backtrace_symbols \
-	       walkcontext dirfd clearenv malloc_usable_size glob fallocate)
+	       walkcontext dirfd clearenv malloc_usable_size glob)
 
 AC_CHECK_LIB(rt, clock_gettime, [
   AC_DEFINE(HAVE_CLOCK_GETTIME,, Define if you have the clock_gettime function)
@@ -584,6 +584,40 @@
   AC_DEFINE(PREAD_WRAPPERS,, Define if pread/pwrite needs _XOPEN_SOURCE 500)
 fi
 
+dnl check for valid fallocate() function
+dnl with 32 bits glibc 2.10, fallocate() exists but not fallocate64()
+dnl when _FILE_OFFSET_BITS==64, fallocate() is redirect to fallocate64()
+dnl and program can't be linked.
+dnl AC_CHECK_FUNC can't catch such errors since it's redefining 
+dnl function prototype.
+AC_SYS_LARGEFILE
+AC_MSG_CHECKING([for valid fallocate() function])
+AC_LINK_IFELSE([
+AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_LINUX_FALLOC_H
+# include <linux/falloc.h>
+#endif
+#include <fcntl.h>
+]],[[
+   long ret;
+
+   ret = fallocate(0, FALLOC_FL_KEEP_SIZE, 0xfffffffful, 0xfffffffful);
+
+   if (ret != 0) {
+      return 1;
+   }
+   ]])],[
+AC_MSG_RESULT([yes])
+AC_DEFINE(HAVE_FALLOCATE,1,[Have valid fallocate() function])],[
+AC_MSG_RESULT([no])])
+
 dnl * Old glibcs have broken posix_fallocate(). Make sure not to use it.
 dnl * It may also be broken in AIX.
 AC_CACHE_CHECK([whether posix_fallocate() works],i_cv_posix_fallocate_works,[
@@ -760,7 +794,6 @@
   AC_MSG_RESULT($visible)
 ])
 
-AC_SYS_LARGEFILE
 AC_CHECK_TYPES(_Bool)
 
 AC_CHECK_TYPE(uoff_t, [