http://pubs.opengroup.org/onlinepubs/009695399/basedefs/netinet/in.h.html:

"The <netinet/in.h> header shall define the following types:
in_port_t
Equivalent to the type uint16_t as defined in <inttypes.h>"

diff -u -r /home/fornwall/lib/android-ndk/platforms/android-19/arch-arm/usr/include/netinet/in.h ./usr/include/netinet/in.h
--- /home/fornwall/lib/android-ndk/platforms/android-19/arch-arm/usr/include/netinet/in.h	2012-08-21 07:23:12.000000000 +0200
+++ ./usr/include/netinet/in.h	2014-07-06 04:31:37.563233271 +0200
@@ -41,6 +41,8 @@
 
 #define INET_ADDRSTRLEN 16
 
+typedef uint16_t in_port_t;
+
 extern int bindresvport (int sd, struct sockaddr_in *sin);
 
 static const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;