+#Function added in urcu 0.7.0
+AC_CHECK_DECL([cmm_smp_mb__before_uatomic_or], [],
+ [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu.h>]]
+)
+
+AC_ARG_WITH(lttng-ust-prefix,
+ AS_HELP_STRING([--with-lttng-ust-prefix=PATH],
+ [Specify the installation prefix of the lttng-ust library.
+ Headers must be in PATH/include; libraries in PATH/lib.]),
+ [
+ CPPFLAGS="$CPPFLAGS -I${withval}/include"
+ LDFLAGS="$LDFLAGS -L${withval}/lib64 -L${withval}/lib"
+ ])