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-rw-r--r--lib/PublicInbox/CodeSearchIdx.pm2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/PublicInbox/CodeSearchIdx.pm b/lib/PublicInbox/CodeSearchIdx.pm
index 5d420de2..570ff64f 100644
--- a/lib/PublicInbox/CodeSearchIdx.pm
+++ b/lib/PublicInbox/CodeSearchIdx.pm
@@ -1305,6 +1305,8 @@ sub cidx_run { # main entry point
                         my $v = $self->{-opt}->{"sort-$_"};
                         push @SORT, "--$_=$v" if defined $v;
                 }
+                ($self->{-opt}->{prune} && $GIT_VER le v2.6) and
+                        die "W: --prune requires git v2.6+\n";
                 init_join_prefork($self)
         }
         local @IDX_SHARDS = cidx_init($self); # forks workers