diff --git a/GNUmakefile b/GNUmakefile
index 8ab8a06..90cb1cc 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -155,6 +155,20 @@ haveinline.h: tryinline.c
 	if ! $(DIET) $(CC) $(CFLAGS) -c tryinline.c >/dev/null 2>&1; then echo "#define inline"; fi > $@
 	-rm -f tryinline.o
 
+havekqueue.h: trykqueue.c
+	-rm -f $@
+	if $(DIET) $(CC) $(CFLAGS) -c trykqueue.c >/dev/null 2>&1; then echo "#define HAVE_KQUEUE"; fi > $@
+	-rm -f trykqueue.o
+
+haveepoll.h: tryepoll.c
+	-rm -f $@
+	if $(DIET) $(CC) $(CFLAGS) -o tryepoll tryepoll.c >/dev/null 2>&1; then echo "#define HAVE_EPOLL 1"; else \
+	if $(DIET) $(CC) $(CFLAGS) -o tryepoll tryepoll.c -lepoll >/dev/null 2>&1; then echo "#define HAVE_EPOLL 2"; fi; fi > $@
+	-rm -f tryepoll
+
+libepoll: haveepoll.h
+	test "`cat haveepoll.h`" = "#define HAVE_EPOLL 2" && echo -lepoll > $@
+
 iopause.h: iopause.h1 iopause.h2 trypoll.c
 	-rm -f $@
 	if $(DIET) $(CC) $(CFLAGS) -o t trypoll.c >/dev/null 2>&1; then cp iopause.h2 iopause.h; else cp iopause.h1 iopause.h; fi
diff --git a/tryepoll.c b/tryepoll.c
new file mode 100644
index 0000000..6fe7485
--- /dev/null
+++ b/tryepoll.c
@@ -0,0 +1,18 @@
+#include <inttypes.h>
+#include <sys/epoll.h>
+
+int main() {
+  int efd=epoll_create(10);
+  struct epoll_event x;
+  if (efd==-1) return 111;
+  x.events=EPOLLIN;
+  x.data.fd=0;
+  if (epoll_ctl(efd,EPOLL_CTL_ADD,0 /* fd */,&x)==-1) return 111;
+  {
+    int i,n;
+    struct epoll_event y[100];
+    if ((n=epoll_wait(efd,y,100,1000))==-1) return 111;
+    if (n>0)
+      printf("event %d on fd #%d\n",y[0].events,y[0].data.fd);
+  }
+}
diff --git a/trykqueue.c b/trykqueue.c
new file mode 100644
index 0000000..1874b64
--- /dev/null
+++ b/trykqueue.c
@@ -0,0 +1,29 @@
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+
+int main() {
+  int kq=kqueue();
+  struct kevent kev;
+  struct timespec ts;
+  if (kq==-1) return 111;
+  EV_SET(&kev, 0 /* fd */, EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, 0);
+  ts.tv_sec=0; ts.tv_nsec=0;
+  if (kevent(kq,&kev,1,0,0,&ts)==-1) return 111;
+
+  {
+    struct kevent events[100];
+    int i,n;
+    ts.tv_sec=1; ts.tv_nsec=0;
+    switch (n=kevent(kq,0,0,events,100,&ts)) {
+    case -1: return 111;
+    case 0: puts("no data on fd #0"); break;
+    }
+    for (i=0; i<n; ++i) {
+      printf("ident %d, filter %d, flags %d, fflags %d, data %d\n",
+             events[i].ident,events[i].filter,events[i].flags,
+             events[i].fflags,events[i].data);
+    }
+  }
+  return 0;
+}