I build nss and nss-softokn on a regular basis and follow the updates.

I am seeing this new error with nss-softokn-3.28.3-8.el7_4.src.rpm

ec.c:21:7: error: 'ECCurve25519' undeclared here (not in a function)

     { ECCurve25519,

Does this ring any bells? Or any suggestion appreciated.