Why p11-kit-1 instead of p11-kit?

[Jim Lloyd]

Sorry to bug the list with this question, but this seems to be a case where
Google does not know all.

I'm attempting to build gnutls 2.12.17 on CentOS 6.0 x86-64. I'm doing this
specifically for PKCS11 support, which we are adding to an existing product.

I have built and installed p11-kit 0.12. But when I configure gnutls I get
this error:

checking for P11_KIT... configure: error: Package requirements (p11-kit-1
>= 0.11) were not met:
No package 'p11-kit-1' found

Why p11-kit-1 instead of p11-kit? Does this indicate that I need a forked
variant of p11-kit?
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