AC_ARG_WITH(urcu, [ --with-urcu path Path to userspace RCU source], [
AC_CHECK_FILE(["$withval/urcu.h"], [
URCU_CFLAGS="-I$withval"
AC_ARG_WITH(urcu, [ --with-urcu path Path to userspace RCU source], [
AC_CHECK_FILE(["$withval/urcu.h"], [
URCU_CFLAGS="-I$withval"
AC_MSG_ERROR([Cannot find urcu.h in urcu directory]))
], [
PKG_CHECK_MODULES(URCU, [liburcu], , [
AC_MSG_ERROR([Cannot find urcu.h in urcu directory]))
], [
PKG_CHECK_MODULES(URCU, [liburcu], , [