encounter error while it is installing opam with macport

[Christopher Jones]

Do what the message tells you. Look in the log file for re2c to see what went wrong.

> On 18 Sep 2015, at 8:32am, 心如烛光 <275438859 at qq.com> wrote:
> 
> Hi,everybody!
>     I wanna install opam for my MacBook Pro (osx10.8.5 mountainlion) with macport. Unfortunately,I get error while it is installing.How could I fix it?Thank you for your help!
> yours!
> here is the message comes from terminal:
> $ sudo port install opam
> --->  Computing dependencies for opam
> --->  Dependencies to be installed: aspcud gringo re2c scons
> --->  Verifying checksums for re2c
> Error: org.macports.checksum for port re2c returned: re2c-0.14.3.tar.gz does not exist in /opt/local/var/macports/distfiles/re2c
> Error: Failed to install re2c
> Please see the log file for port re2c for details:
>     /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_re2c/re2c/main.log
> Error: The following dependencies were not installed: aspcud gringo re2c scons
> To report a bug, follow the instructions in the guide:
>     http://guide.macports.org/#project.tickets
> Error: Processing of port opam failed
> 
> 
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