How to solve the "undefined reference to 'ntohl'" compile error in Android NDK?

Issue

How to solve the compile error?

 error: undefined reference to 'ntohl' 
 collect2: error: ld returned 1 exit status

I use the android-ndk-r10d.

Solution

When building with the Android NDK, ntohl and the other functions for converting between network and host byte order are #defines present in the header <sys/endian.h>. So including that header should fix your compilation error.

Answered By - Michael