[SOLVED] Firefox 81 build failure on -current

My last successful build for Firefox with the -current build scripts was 80.0.1. 81.0 now fails with:

.....
chmod: cannot operate on dangling symlink './obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3/lib/python3.6/keyword.py'
chmod: cannot operate on dangling symlink './obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3/lib/python3.6/_dummy_thread.py'
chmod: cannot operate on dangling symlink './obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3/include/python3.6m'
which: no python in (/root/.mozbuild/_virtualenvs/mach/bin)
This mach command requires /root/.mozbuild/_virtualenvs/mach/bin/python, which wasn't found on the system!
Consider running 'mach bootstrap' or 'mach create-mach-environment' to create the mach virtualenvs, or set MACH_USE_SYSTEM_PYTHON to use the system Python installation over a virtualenv.

I initially thought this was a bad source archive so downloaded it again but same issue.

Any ideas?

Thanks, Robby

just add a line modifying the mozilla-firefox.SlackBuild like this

--- ./mozilla-firefox.SlackBuild.orig   2020-07-27 18:28:45.826984853 +0200
+++ ./mozilla-firefox.SlackBuild        2020-09-22 20:42:49.671592000 +0200
@@ -256,6 +257,7 @@
     browser/installer/package-manifest.in || exit 1
 fi
 
+export MACH_USE_SYSTEM_PYTHON="1"
 export MOZILLA_OFFICIAL="1"
 export BUILD_OFFICIAL="1"
 export MOZ_PHOENIX="1"

Thanks very much Ponce - all sorted!

Firefox > Menu > Help > Troubleshooting info > Distribution ID ???

Wipe ?

i think " Slackware $ARCH $VERSION ", or no ? or harden ex. "Slackware 15.0 amd64" ?

also "Application Binary /usr/lib64/firefox/firefox-bin" is a library ? or /usr/"and what" ?

What did you mean ?

Today at Firefox 83.0 and LibreOffice 6.4.2.2-2 (latest, no updates wanted)

Originally Posted by Roman Dyaba Firefox > Menu > Help > Troubleshooting info > Distribution ID ??? Wipe ? i think " Slackware $ARCH $VERSION ", or no ? or harden ex. "Slackware 15.0 amd64" ? also "Application Binary /usr/lib64/firefox/firefox-bin" is a library ? or /usr/"and what" ? What did you mean ? Today at Firefox 83.0 and LibreOffice 6.4.2.2-2 (latest, no updates wanted)

What value does this add to an already resolved question? Your remarks are useless. And this is not the only thread where I notice this. Stop posting spam in topic threads. Are you a bot?