If you encounter the error like this：

xxx: In function `crypto_derive_key':undefined reference to `crypto_pwhash'
xxx: In function `cipher_aead_decrypt':undefined reference to `crypto_aead_xchacha20poly1305_ietf_decrypt'
xxx: In function `cipher_aead_encrypt':undefined reference to `crypto_aead_xchacha20poly1305_ietf_encrypt'
collect2: error: ld returned 1 exit status
make[2]: *** [xxx] Error 1
make[2]: Leaving directory `xxx'
make[1]: *** [xxx] Error 1
make[1]: Leaving directory `xxx'
make: *** [all] Error 2

Try: 1.Remove old libsodium from system,run apt-get purge libsodium-dev, and compile again

  1. Try to add libsodium path along with ./configure command like ./configure –with-sodium=xxx