port clang-10 fetch issue?

[mpachucki (Mark Pachucki)]

Hi folks, I'm trying to 'sudo port install clang-10 pkgconfig' (in order to install R software, a package called data.table, which requires OpenMP, which requires llvm) and appear to be getting a 'Warning: failed to verify signature for archive!' error, which appears to be a fetch-related error.

---> Computing dependencies for clang-10 ---> Fetching archive for clang_select ---> Attempting to fetch clang_select-2.2_0.darwin_19.noarch.tbz2 from ​http://jog.id.packages.macports.org/macports/packages/clang_select ---> Attempting to fetch clang_select-2.2_0.darwin_19.noarch.tbz2.rmd160 from ​http://jog.id.packages.macports.org/macports/packages/clang_select Warning: Failed to verify signature for archive!

It's apparently hanging on 'clang-select' before moving down to the other dependencies. I already tried (1) sudo port clean, (2) searching prior tickets (closest was ticket #60584), (3) I don't think it's a port upgrade issue, (4) under problemhotlist, when I visit the main MacPorts distfiles mirror, clang-10 doesn't appear there. Any ideas? (I'm following a installation wiki here: ​https://github.com/Rdatatable/data.table/wiki/Installation#openmp-enabled-compiler-for-mac) I'm a professor who uses R for data analysis, and not a developer, so any layperson language would be greatly appreciated. I'm running Mac OS 10.15.6, Xcode 12 (which some will likely point out is the first problem). Thanks in advance.