subversion install error: neon checksum

[Alexy Khrabrov]

While installing subversion port, neon was reported as failing
checksum.   After that, any attempt to proceed shows this:

~ sudo port install -dv subversion
--->  Verifying checksum(s) for neon
Error: Target com.apple.checksum returned: Could not open file:
/opt/local/var/db/dports/distfiles/neon/neon-0.25.5.tar.gz
Error: The following dependencies failed to build: neon
Error: Status 1 encountered during processing.

How do I get past neon?

Cheers,
Alexy