https://sourceforge.net/p/sigrok/mailman/message/32459770/

From 27ecf0c85482786f7617571c690797ab3f07f795 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Sat, 14 Jun 2014 01:38:58 -0400
Subject: [PATCH 2/2] do not add check to common cflags/libs

Only the unittests use these flags, so don't go linking them in for
the main library too.
---
 configure.ac | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 3f661ec..10213a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -134,8 +134,7 @@ AC_SEARCH_LIBS([pow], [m])
 
 # The Check unit testing framework is optional. Disable if not found.
 PKG_CHECK_MODULES([check], [check >= 0.9.4],
-	[have_check="yes"; CFLAGS="$CFLAGS $check_CFLAGS";
-	LIBS="$LIBS $check_LIBS"], [have_check="no"])
+	[have_check="yes"], [have_check="no"])
 AM_CONDITIONAL(HAVE_CHECK, test x"$have_check" = "xyes")
 
 # libsigrok is optional (only used for the protocol decoder test framework).
-- 
2.0.0