--- libev/ev.c	2019/06/20 22:44:59	1.490
+++ libev/ev.c	2019/06/20 23:14:53	1.491
@@ -117,6 +117,15 @@
 #  define EV_USE_EPOLL 0
 # endif
    
+# if HAVE_LINUX_AIO_ABI_H
+#  ifndef EV_USE_LINUXAIO
+#   define EV_USE_LINUXAIO EV_FEATURE_BACKENDS
+#  endif
+# else
+#  undef EV_USE_LINUXAIO
+#  define EV_USE_LINUXAIO 0
+# endif
+   
 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
 #  ifndef EV_USE_KQUEUE
 #   define EV_USE_KQUEUE EV_FEATURE_BACKENDS
@@ -429,6 +438,14 @@
 # endif
 #endif
 
+#if EV_USE_LINUXAIO
+# include <sys/syscall.h>
+# if !SYS_io_getevents
+#  undef EV_USE_LINUXAIO
+#  define EV_USE_LINUXAIO 0
+# endif
+#endif
+
 #if EV_USE_INOTIFY
 # include <sys/statfs.h>
 # include <sys/inotify.h>
@@ -2787,6 +2804,9 @@
   flags &= ~EVBACKEND_POLL;   /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
 #endif
 
+  /* TODO: linuxaio is very experimental */
+  flags &= ~EVBACKEND_LINUXAIO;
+
   return flags;
 }