From 2376bde57d44194e59b85b20411e52307b43ec2e Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 11 Dec 2017 15:12:56 +0100
Subject: Only check librt if UHD enabled

---
 configure.ac | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index d260f9e..47e1c81 100644
--- a/configure.ac
+++ b/configure.ac
@@ -128,8 +128,9 @@ AC_SUBST([LIBS], ["$FFTW_LIBS $SOAPYSDR_LIBS $PTHREAD_LIBS $ZMQ_LIBS"])
 
 # Checks for UHD.
 AS_IF([test "x$enable_output_uhd" = "xyes"],
-      [AC_CHECK_LIB([uhd], [main], [],
-                   [AC_MSG_ERROR([library uhd is missing])] )])
+      [ AC_CHECK_LIB([uhd], [main], [], [AC_MSG_ERROR([library uhd is missing])])
+        AC_CHECK_LIB([rt], [clock_gettime], [], [AC_MSG_ERROR([library rt is missing])])
+      ])
 
 AS_IF([test "x$enable_output_uhd" = "xyes"],
       [AC_DEFINE(HAVE_OUTPUT_UHD, [1], [Define if UHD output is enabled])])
@@ -141,8 +142,6 @@ AX_BOOST_BASE([1.54.0], [], AC_MSG_ERROR([BOOST 1.54 or later is required]))
 AX_BOOST_SYSTEM
 AX_BOOST_THREAD
 
-AC_CHECK_LIB([rt], [clock_gettime], [], [AC_MSG_ERROR([library rt is missing])])
-
 # Tests for different memory allocation debuggers.
 # Valgrind doesn't need any.
 AS_IF([test "x$enable_debug" != "xno"],
-- 
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