diff --git a/moo/Makefile.in b/moo/Makefile.in
index e5941b7..7460a03 100644
--- a/moo/Makefile.in
+++ b/moo/Makefile.in
@@ -356,7 +356,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
diff --git a/moo/bin/Makefile.in b/moo/bin/Makefile.in
index 00444f7..e34debe 100644
--- a/moo/bin/Makefile.in
+++ b/moo/bin/Makefile.in
@@ -340,7 +340,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
diff --git a/moo/configure b/moo/configure
index 7a1b36a..2768937 100755
--- a/moo/configure
+++ b/moo/configure
@@ -793,7 +793,6 @@ infodir
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -893,7 +892,6 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1146,15 +1144,6 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
-  -runstatedir | --runstatedir | --runstatedi | --runstated \
-  | --runstate | --runstat | --runsta | --runst | --runs \
-  | --run | --ru | --r)
-    ac_prev=runstatedir ;;
-  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
-  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
-  | --run=* | --ru=* | --r=*)
-    runstatedir=$ac_optarg ;;
-
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1292,7 +1281,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir runstatedir
+		libdir localedir mandir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1445,7 +1434,6 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -18279,7 +18267,7 @@ fi
 
 done
 
-for ac_header in sys/devpoll.h sys/epoll.h poll.h
+for ac_header in sys/devpoll.h sys/epoll.h poll.h sys/event.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
@@ -18416,7 +18404,7 @@ _ACEOF
 fi
 done
 
-for ac_func in accept4 pipe2 epoll_create1
+for ac_func in accept4 pipe2 epoll_create epoll_create1 kqueue kqueue1
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
diff --git a/moo/configure.ac b/moo/configure.ac
index 8c5db5d..8711d8e 100644
--- a/moo/configure.ac
+++ b/moo/configure.ac
@@ -135,7 +135,7 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS([stddef.h wchar.h wctype.h errno.h signal.h fcntl.h dirent.h])
 AC_CHECK_HEADERS([time.h sys/time.h utime.h spawn.h execinfo.h ucontext.h])
 AC_CHECK_HEADERS([dlfcn.h ltdl.h sys/mman.h])
-AC_CHECK_HEADERS([sys/devpoll.h sys/epoll.h poll.h])
+AC_CHECK_HEADERS([sys/devpoll.h sys/epoll.h poll.h sys/event.h])
 AC_CHECK_HEADERS([netinet/in.h sys/un.h netpacket/packet.h net/if_dl.h])
 AC_CHECK_HEADERS([xcb/xcb.h])
 AC_CHECK_HEADERS([ffi.h dyncall.h libunwind.h])
@@ -155,7 +155,7 @@ AC_CHECK_FUNCS([clock_nanosleep nanosleep usleep])
 AC_CHECK_FUNCS([localtime_r gmtime_r])
 AC_CHECK_FUNCS([sigaction signal])
 AC_CHECK_FUNCS([snprintf _vsnprintf _vsnwprintf strerror_r])
-AC_CHECK_FUNCS([accept4 pipe2 epoll_create1])
+AC_CHECK_FUNCS([accept4 pipe2 epoll_create epoll_create1 kqueue kqueue1])
 AC_CHECK_FUNCS([isatty mmap munmap])
 
 save_LIBS="$LIBS"
diff --git a/moo/lib/Makefile.in b/moo/lib/Makefile.in
index 642a228..d243c2c 100644
--- a/moo/lib/Makefile.in
+++ b/moo/lib/Makefile.in
@@ -423,7 +423,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
diff --git a/moo/lib/moo-cfg.h.in b/moo/lib/moo-cfg.h.in
index fcf6256..db7169a 100644
--- a/moo/lib/moo-cfg.h.in
+++ b/moo/lib/moo-cfg.h.in
@@ -60,6 +60,9 @@
 /* dyncall library is available */
 #undef HAVE_DYNCALL_LIB
 
+/* Define to 1 if you have the `epoll_create' function. */
+#undef HAVE_EPOLL_CREATE
+
 /* Define to 1 if you have the `epoll_create1' function. */
 #undef HAVE_EPOLL_CREATE1
 
@@ -108,6 +111,12 @@
 /* Define to 1 if you have the `isatty' function. */
 #undef HAVE_ISATTY
 
+/* Define to 1 if you have the `kqueue' function. */
+#undef HAVE_KQUEUE
+
+/* Define to 1 if you have the `kqueue1' function. */
+#undef HAVE_KQUEUE1
+
 /* labels as values */
 #undef HAVE_LABELS_AS_VALUES
 
@@ -237,6 +246,9 @@
 /* Define to 1 if you have the <sys/epoll.h> header file. */
 #undef HAVE_SYS_EPOLL_H
 
+/* Define to 1 if you have the <sys/event.h> header file. */
+#undef HAVE_SYS_EVENT_H
+
 /* Define to 1 if you have the <sys/mman.h> header file. */
 #undef HAVE_SYS_MMAN_H
 
diff --git a/moo/mod/Makefile.in b/moo/mod/Makefile.in
index 0c7be37..0eae471 100644
--- a/moo/mod/Makefile.in
+++ b/moo/mod/Makefile.in
@@ -427,7 +427,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
diff --git a/moo/t/Makefile.in b/moo/t/Makefile.in
index 37ea0ba..cc3d916 100644
--- a/moo/t/Makefile.in
+++ b/moo/t/Makefile.in
@@ -335,7 +335,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
diff --git a/moo/wasm/Makefile.in b/moo/wasm/Makefile.in
index 3234859..f366ce4 100644
--- a/moo/wasm/Makefile.in
+++ b/moo/wasm/Makefile.in
@@ -270,7 +270,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@