When running brew install --build-from-source Menci/libvirt-m1/virt-viewer get 404

[tempusthales]

When I attempt to run brew install --build-from-source Menci/libvirt-m1/virt-viewer I get at some point a 404 error:

~ brew install --build-from-source Menci/libvirt-m1/virt-viewer 
==> Fetching dependencies for menci/libvirt-m1/virt-viewer: gtk-vnc and libvirt
==> Fetching gtk-vnc
==> Downloading https://ghcr.io/v2/homebrew/core/gtk-vnc/manifests/1.3.1-1
Already downloaded: /Users/gil/Library/Caches/Homebrew/downloads/c968bd182690cd6fb85ef70aacf28df573f3611f01fd60b61448507cfb34a04d--gtk-vnc-1.3.1-1.bottle_manifest.json
==> Downloading https://ghcr.io/v2/homebrew/core/gtk-vnc/blobs/sha256:74998a793c0d7fd96b2a9d4a7ed4b0da1a4d84dce9c2f3aac187fb1430f43423
Already downloaded: /Users/gil/Library/Caches/Homebrew/downloads/521499f2f79abb675f40668ed2de9d5f51ba2e247a04f45f77f47b2fa63ede01--gtk-vnc--1.3.1.arm64_ventura.bottle.1.tar.gz
==> Fetching libvirt
==> Downloading https://ghcr.io/v2/homebrew/core/libvirt/manifests/9.3.0
Already downloaded: /Users/gil/Library/Caches/Homebrew/downloads/10c3ea93aaf0b031b8c0d26fe1b60c77c632997a15198757f3f2445da8cf69a9--libvirt-9.3.0.bottle_manifest.json
==> Downloading https://ghcr.io/v2/homebrew/core/libvirt/blobs/sha256:7b1b9039529dd54dec14cead702f333b1a35a41f7060a7dca60b8d32108d09e9
Already downloaded: /Users/gil/Library/Caches/Homebrew/downloads/01d0df97359c3591a89644929d5a2899be867459ee9a66faa0dfe05b69a15e70--libvirt--9.3.0.arm64_ventura.bottle.tar.gz
==> Fetching menci/libvirt-m1/virt-viewer
Error: virt-viewer: Failed to download resource "virt-viewer"
Failure while executing; `/usr/bin/env /opt/homebrew/Library/Homebrew/shims/shared/curl --disable --cookie /dev/null --globoff --show-error --user-agent Homebrew/4.0.16\ \(Macintosh\;\ arm64\ Mac\ OS\ X\ 13.4\)\ curl/7.88.1 --header Accept-Language:\ en --retry 3 --fail --location --silent --head --request GET https://virt-manager.org/download/sources/virt-viewer/virt-viewer-9.0.tar.gz` exited with 22. Here's the output:
curl: (22) The requested URL returned error: 404
HTTP/2 404 
server: GitHub.com
content-type: text/html; charset=utf-8
access-control-allow-origin: *
etag: "64556a8c-247b"
content-security-policy: default-src 'none'; style-src 'unsafe-inline'; img-src data:; connect-src 'self'
x-proxy-cache: MISS
x-github-request-id: D7FE:2061:1147A27:1AE53A0:645835B5
accept-ranges: bytes
date: Sun, 07 May 2023 23:41:09 GMT
via: 1.1 varnish
age: 352
x-served-by: cache-dfw-kdfw8210031-DFW
x-cache: HIT
x-cache-hits: 1
x-timer: S1683502869.421621,VS0,VE2
vary: Accept-Encoding
x-fastly-request-id: 05088f2ac6e86140d0e69d1f912429f3b728526a
content-length: 9339