Added a check for poll.h.

diff --git a/configure b/configure
index 26e961f..a8ff547 100755
--- a/configure
+++ b/configure
@@ -7261,6 +7261,7 @@
 
 
 
+
 for ac_header in \
 	arpa/inet.h \
 	arpa/nameser.h \
@@ -7296,6 +7297,7 @@
 	netinet/tcp.h \
 	netinet/tcp_fsm.h \
 	openssl/ssl.h \
+	poll.h \
 	process.h \
 	pthread.h \
 	pwd.h \