POSIX.pm shipped with Perl 5.16.3 did not support lround,
at least.  So just rely on built-in core functions.
---
 lib/PublicInbox/LeiQuery.pm | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/PublicInbox/LeiQuery.pm b/lib/PublicInbox/LeiQuery.pm
index 385ba0a9..f51dc93b 100644
--- a/lib/PublicInbox/LeiQuery.pm
+++ b/lib/PublicInbox/LeiQuery.pm
@@ -5,7 +5,6 @@
 package PublicInbox::LeiQuery;
 use strict;
 use v5.10.1;
-use POSIX ();
 
 sub prep_ext { # externals_each callback
        my ($lxs, $exclude, $loc) = @_;
@@ -22,7 +21,7 @@ sub _start_query { # used by "lei q" and "lei up"
        }
        my $lxs = $self->{lxs};
        $xj ||= $lxs->concurrency($opt); # allow: "--jobs ,$WRITER_ONLY"
-       my $nproc = $lxs->detect_nproc // 1; # don't memoize, schedtool(1) 
exists
+       my $nproc = $lxs->detect_nproc || 1; # don't memoize, schedtool(1) 
exists
        $xj = $nproc if $xj > $nproc;
        $lxs->{-wq_nr_workers} = $xj;
        if (defined($mj) && $mj !~ /\A[1-9][0-9]*\z/) {
@@ -36,8 +35,7 @@ sub _start_query { # used by "lei q" and "lei up"
                $self->_lei_store(1)->write_prepare($self);
        }
        $l2m and $l2m->{-wq_nr_workers} = $mj // do {
-               $mj = POSIX::lround($nproc * 3 / 4); # keep some CPU for git
-               $mj <= 0 ? 1 : $mj;
+               $mj = int($nproc * 0.75 + 0.5); # keep some CPU for git
        };
 
        # descending docid order is cheapest, MUA controls sorting order
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