@@ -, +, @@ package is not installed 1/ build koha package from souce, install package 2/ test plack, see following error... Error while loading /etc/koha/plack.psgi: Can't locate CGI/Emulate/PSGI.pm in @INC (you may need to install the CGI::Emulate::PSGI module) 3/ apply patch 4/ build koha package from souce, install package 5/ test plack, see no error and observe plack is working --- debian/control | 4 ++++ 1 file changed, 4 insertions(+) --- a/debian/control +++ a/debian/control @@ -100,6 +100,8 @@ Build-Depends: libalgorithm-checkdigits-perl, libpdf-reuse-barcode-perl, libpdf-reuse-perl, libpdf-table-perl, + libplack-perl, + libcgi-emulate-psgi-perl, libplack-middleware-reverseproxy-perl, libreadonly-perl, libreadonly-xs-perl, @@ -329,6 +331,8 @@ Depends: libalgorithm-checkdigits-perl, libpdf-reuse-barcode-perl, libpdf-reuse-perl, libpdf-table-perl, + libplack-perl, + libcgi-emulate-psgi-perl, libplack-middleware-reverseproxy-perl, libreadonly-perl, libreadonly-xs-perl, --