Bug#961486: perl6-zef FTBFS: Failed to create directory '/sbuild-nonexistent/.raku/precomp'

[Adrian Bunk]

Source: perl6-zef
Version: 0.8.4-1
Severity: serious
Tags: ftbfs

https://buildd.debian.org/status/fetch.php?pkg=perl6-zef&arch=all&ver=0.8.4-1&stamp=1590249709&raw=0

...
   debian/rules override_dh_auto_test
make[1]: Entering directory '/<<PKGBUILDDIR>>'
prove6 -l
===SORRY!=== Error while compiling /usr/bin/prove6
Failed to create directory '/sbuild-nonexistent/.raku/precomp' with mode '0o777': Failed to mkdir: Permission denied
at /usr/bin/prove6:3
Actually thrown at:
  in any statement_control at /usr/lib/perl6/lib/Perl6/Grammar.moarvm line 1

make[1]: *** [debian/rules:13: override_dh_auto_test] Error 1