if test "x$have_openat" = xno; then
AC_MSG_WARN([openat() function not found; do not build lsblk])
build_lsblk=no
-elif test "x$have_linux" = xno; then
+elif test "x$linux_os" = xno; then
AC_MSG_WARN([non-linux system; do not build lsblk])
build_lsblk=no
fi