Thank you to Martin Thomson of the NSS dev team!!! His hint helped me to find and fix the problem.

The issue is that the nss-softokn-3.28.3.tar.gz source, will not build with an older nss-softokn installed.

In other words, it is circularly dependent on itself to build from source.

For me the fix was to download a current 3.28.3 binary from centos and install it.

Then it built fine.

It would be nice if the build used its own local includes rather than the system includes.

This is what glibc and others do to avoid this type of dependency.

Thanks again!

On Wed, Sep 27, 2017 at 6:13 PM, Captain Wiggum <captwiggum@gmail.com> wrote:

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.