diff -uBrN autoconf/lib/autoconf/headers.m4 autoconf_modified/lib/autoconf/headers.m4
--- autoconf/lib/autoconf/headers.m4	2009-07-29 18:28:56.000000000 +0400
+++ autoconf_modified/lib/autoconf/headers.m4	2009-08-04 22:37:39.000000000 +0400
@@ -77,7 +77,7 @@
 # only.
 #
 # If INCLUDES is empty, then check both via the compiler and preproc.
-# If the results are different, issue a warning, but keep the preproc
+# If the results are different, issue a warning, but keep the compiler
 # result.
 #
 # If INCLUDES is `-', keep only the old semantics.
@@ -101,7 +101,15 @@
 [  AS_LINENO_PUSH([$[]1])
   AS_VAR_SET_IF([$[]3],
 		[AC_CACHE_CHECK([for $[]2], [$[]3], [])],
-		[# Is the header compilable?
+		[# Is the header present?
+AC_MSG_CHECKING([$[]2 presence])
+AC_PREPROC_IFELSE([AC_LANG_SOURCE(address@hidden:@include <$[]2>])],
+		  [ac_header_preproc=yes],
+		  [ac_header_preproc=no])
+AC_MSG_RESULT([$ac_header_preproc])
+
+# Is the header compilable?
+
 AC_MSG_CHECKING([$[]2 usability])
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([$[]4
 @%:@include <$[]2>])],
@@ -109,13 +117,6 @@
 		  [ac_header_compiler=no])
 AC_MSG_RESULT([$ac_header_compiler])
 
-# Is the header present?
-AC_MSG_CHECKING([$[]2 presence])
-AC_PREPROC_IFELSE([AC_LANG_SOURCE(address@hidden:@include <$[]2>])],
-		  [ac_header_preproc=yes],
-		  [ac_header_preproc=no])
-AC_MSG_RESULT([$ac_header_preproc])
-
 # So?  What about this header?
 case $ac_header_compiler:$ac_header_preproc:$ac_[]_AC_LANG_ABBREV[]_preproc_warn_flag in #((
   yes:no: )