fping: Checksum (md5) mismatch for fping.tar.gz

[Damien@…]

fping fails to install, with the following output:

$ port info fping
fping @2.4b2 (net)
Variants:    (+)ipv6, universal
…

$ port -d install fping
DEBUG: Found port in file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/net/fping 
DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/ports/net/fping
DEBUG: setting option os.universal_supported to yes
DEBUG: org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided
DEBUG: adding the default universal variant
DEBUG: Requested variant darwin is not provided by port fping.
DEBUG: Requested variant i386 is not provided by port fping.
DEBUG: Requested variant x11 is not provided by port fping.
DEBUG: Requested variant macosx is not provided by port fping.
DEBUG: Executing variant ipv6 provides ipv6
DEBUG: Executing org.macports.main (fping)
DEBUG: Skipping completed org.macports.unarchive (fping)
DEBUG: Skipping completed org.macports.fetch (fping)
--->  Verifying checksum(s) for fping
DEBUG: Executing org.macports.checksum (fping)
--->  Checksumming fping.tar.gz
Error: Checksum (md5) mismatch for fping.tar.gz
Portfile checksum: fping.tar.gz md5 b1f10f88afd35b94846bfb0844d7a834
Distfile checksum: fping.tar.gz md5 d5e8be59e307cef76bc479e1684df705
The correct checksum line may be:
checksums           md5     d5e8be59e307cef76bc479e1684df705 \
                    sha1    9318f2ec4b389cd74ca32f561fea95f9528f16a3 \
                    rmd160  643af0593e42a78534026498adc544bf21afe4fd
Error: Target org.macports.checksum returned: Unable to verify file checksums
Warning: the following items did not execute (for fping): org.macports.activate org.macports.extract org.macports.checksum org.macports.patch org.macports.configure org.macports.build org.macports.destroot org.macports.archive org.macports.install
Error: Status 1 encountered during processing.