MakeError for bsdtar in pacman doesn't output stdout

[arran4]

All I get is this:

$ cp -fr build/linux/x64/release/bundle/. dist/0.0.2+2/linkwarden_mobile-0.0.2+2-linux_pacman/usr/share/linkwarden_mobile/
$ bsdtar -czf .MTREE --format=mtree --options=!all,use-set,type,uid,gid,mode,time,size,md5,sha256,link .PKGINFO .INSTALL usr
MakeError
#0      AppPackageMakerPacman._make (package:flutter_app_packager/src/makers/pacman/app_package_maker_pacman.dart:144:7)
<asynchronous suspension>
#1      FlutterDistributor.package (package:flutter_distributor/src/flutter_distributor.dart:182:35)
<asynchronous suspension>
#2      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>

Unhandled exception:
MakeError
#0      AppPackageMakerPacman._make (package:flutter_app_packager/src/makers/pacman/app_package_maker_pacman.dart:144:7)
<asynchronous suspension>
#1      FlutterDistributor.package (package:flutter_distributor/src/flutter_distributor.dart:182:35)
<asynchronous suspension>
#2      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>