[sheepdog] [PATCH] configure.ac: fix building failed in jenkins

[Ruoyu]

Because clock_gettime was introduced, we should check it first.
Otherwise, compilation may be failed in some Linux distribution.

Signed-off-by: Ruoyu <liangry at ucweb.com>
---
 configure.ac | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7e6691f..6a9e552 100644
--- a/configure.ac
+++ b/configure.ac
@@ -88,6 +88,7 @@ AM_MISSING_PROG(AUTOM4TE, autom4te, $missing_dir)
 
 # Checks for libraries.
 AC_CHECK_LIB([socket], [socket])
+AC_CHECK_LIB([rt], [clock_gettime], , AC_MSG_ERROR(librt not found))
 
 # Checks for header files.
 AC_FUNC_ALLOCA
@@ -334,8 +335,6 @@ if test "x${enable_trace}" = xyes; then
 		AC_MSG_ERROR(requires binutils-dev))
 	AC_CHECK_HEADERS([bfd.h],,
 		AC_MSG_ERROR(requires binutils-dev))
-	AC_CHECK_LIB([rt], [clock_gettime],,
-		AC_MSG_ERROR(librt not found))
 	AC_DEFINE_UNQUOTED([HAVE_TRACE], 1, [have trace])
 	PACKAGE_FEATURES="$PACKAGE_FEATURES trace"
 fi
-- 
1.8.3.2