diff --git a/runtime/ftplugin/perl.vim b/runtime/ftplugin/perl.vim
index 603ba49..d0bdbc0 100644
--- a/runtime/ftplugin/perl.vim
+++ b/runtime/ftplugin/perl.vim
@@ -3,7 +3,8 @@
 " Maintainer:    vim-perl <vim-perl@googlegroups.com>
 " Homepage:      https://github.com/vim-perl/vim-perl
 " Bugs/requests: https://github.com/vim-perl/vim-perl/issues
-" Last Change:   2020 Apr 15
+" License:       Vim License (see :help license)
+" Last Change:   2021 Nov 10
 
 if exists("b:did_ftplugin") | finish | endif
 let b:did_ftplugin = 1
@@ -20,27 +21,36 @@
 setlocal comments=:#
 setlocal commentstring=#%s
 
-" Change the browse dialog on Win32 to show mainly Perl-related files
-if has("gui_win32")
-    let b:browsefilter = "Perl Source Files (*.pl)\t*.pl\n" .
-		       \ "Perl Modules (*.pm)\t*.pm\n" .
-		       \ "Perl Documentation Files (*.pod)\t*.pod\n" .
-		       \ "All Files (*.*)\t*.*\n"
-endif
-
 " Provided by Ned Konz <ned at bike-nomad dot com>
 "---------------------------------------------
 setlocal include=\\<\\(use\\\|require\\)\\>
-setlocal includeexpr=substitute(substitute(substitute(v:fname,'::','/','g'),'->\*','',''),'$','.pm','')
+" '+' is removed to support plugins in Catalyst or DBIx::Class
+" where the leading plus indicates a fully-qualified module name.
+setlocal includeexpr=substitute(substitute(substitute(substitute(v:fname,'+','',''),'::','/','g'),'->\*','',''),'$','.pm','')
 setlocal define=[^A-Za-z_]
 setlocal iskeyword+=:
 
 " The following line changes a global variable but is necessary to make
 " gf and similar commands work. Thanks to Andrew Pimlott for pointing
-" out the problem. If this causes a problem for you, add an
-" after/ftplugin/perl.vim file that contains
-"       set isfname-=:
+" out the problem.
+let s:old_isfname = &isfname
 set isfname+=:
+let s:new_isfname = &isfname
+
+augroup perl_global_options
+  au!
+  exe "au BufEnter * if &filetype == 'perl' | let &isfname = '" . s:new_isfname . "' | endif"
+  exe "au BufLeave * if &filetype == 'perl' | let &isfname = '" . s:old_isfname . "' | endif"
+augroup END
+
+" Undo the stuff we changed.
+let b:undo_ftplugin = "setlocal fo< kp< com< cms< inc< inex< def< isk<" .
+      \               " | let &isfname = '" .  s:old_isfname . "'"
+
+if get(g:, 'perl_fold', 0)
+  setlocal foldmethod=syntax
+  let b:undo_ftplugin .= " | setlocal fdm<"
+endif
 
 " Set this once, globally.
 if !exists("perlpath")
@@ -74,16 +84,26 @@
 else
     let &l:path=&l:path.",".perlpath
 endif
+
+let b:undo_ftplugin .= " | setlocal pa<"
 "---------------------------------------------
 
-" Undo the stuff we changed.
-let b:undo_ftplugin = "setlocal fo< com< cms< inc< inex< def< isk< isf< kp< path<" .
-	    \	      " | unlet! b:browsefilter"
+" Change the browse dialog to show mainly Perl-related files
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
+    let b:browsefilter = "Perl Source Files (*.pl)\t*.pl\n" .
+		       \ "Perl Modules (*.pm)\t*.pm\n" .
+		       \ "Perl Documentation Files (*.pod)\t*.pod\n" .
+		       \ "All Files (*.*)\t*.*\n"
+    let b:undo_ftplugin .= " | unlet! b:browsefilter"
+endif
 
-" proper matching for matchit plugin
-let b:match_skip = 's:comment\|string\|perlQQ\|perlShellCommand\|perlHereDoc\|perlSubstitution\|perlTranslation\|perlMatch\|perlFormatField'
-let b:match_words = '\<if\>:\<elsif\>:\<else\>'
+" Proper matching for matchit plugin
+if exists("loaded_matchit") && !exists("b:match_words")
+    let b:match_skip = 's:comment\|string\|perlQQ\|perlShellCommand\|perlHereDoc\|perlSubstitution\|perlTranslation\|perlMatch\|perlFormatField'
+    let b:match_words = '\<if\>:\<elsif\>:\<else\>'
+    let b:undo_ftplugin .= " | unlet! b:match_words b:match_skip"
+endif
 
 " Restore the saved compatibility options.
 let &cpo = s:save_cpo
-unlet s:save_cpo
+unlet s:save_cpo s:old_isfname s:new_isfname