I am trying to install openvpn-2.1.4 but at the end of the compiling i get this error message:
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make[2]: Entering directory `/root/openvpn/openvpn-2.1.4'
gcc -g -O2 -o openvpn base64.o buffer.o crypto.o dhcp.o error.o event.o fdmisc.o forward.o fragment.o gremlin.o helper.o httpdigest.o lladdr.o init.o interval.o list.o lzo.o manage.o mbuf.o misc.o mroute.o mss.o mtcp.o mtu.o mudp.o multi.o ntlm.o occ.o pkcs11.o openvpn.o options.o otime.o packet_id.o perf.o pf.o ping.o plugin.o pool.o proto.o proxy.o ieproxy.o ps.o push.o reliable.o route.o schedule.o session_id.o shaper.o sig.o socket.o socks.o ssl.o status.o thread.o tun.o win32.o cryptoapi.o -lssl -lcrypto -ldl
buffer.o: In function `buf_len':
/root/openvpn/openvpn-2.1.4/buffer.h:146: undefined reference to `__builtin_expect'
/root/openvpn/openvpn-2.1.4/buffer.h:146: undefined reference to `__builtin_expect'
buffer.o: In function `array_mult_safe':
/root/openvpn/openvpn-2.1.4/buffer.c:40: undefined reference to `__builtin_expect'
/root/openvpn/openvpn-2.1.4/buffer.c:40: undefined reference to `__builtin_expect'
/root/openvpn/openvpn-2.1.4/buffer.c:40: undefined reference to `__builtin_expect'
buffer.o:/root/openvpn/openvpn-2.1.4/buffer.c:40: more undefined references to `__builtin_expect' follow
collect2: ld returned 1 exit status
make[2]: *** [openvpn] Error 1
make[2]: Leaving directory `/root/openvpn/openvpn-2.1.4'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/openvpn/openvpn-2.1.4'
make: *** [all] Error 2
