AM_CONDITIONAL([HAVE_JAVAH], [test "x$JAVAH" != "x"])
AM_CONDITIONAL([HAVE_PERF_EVENT], [test "x$ac_cv_header_linux_perf_event_h" = "xyes"])
+
+## ##
+## Substitute variables for use in Makefile.am ##
+## ##
+
+# Library versions for libtool
+AC_SUBST([LTTNG_UST_LIBRARY_VERSION], ust_lib_version)
+AC_SUBST([LTTNG_UST_CTL_LIBRARY_VERSION], ust_ctl_lib_version)
+
AM_CFLAGS="-Wall $URCU_CFLAGS $PTHREAD_CFLAGS"
AC_SUBST(AM_CFLAGS)