made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/compiler/groff.vim

@@ -0,0 +1,45 @@
+" Vim compiler file
+" Compiler:     Groff
+" Maintainer:   Konfekt
+" Last Change:	2024 Nov 19
+"
+" Expects output file extension, say `:make html` or `:make pdf`.
+" Supported devices as of Sept 2024 are: (x)html, pdf, ps, dvi, lj4, lbp ...
+" Adjust command-line flags, language, encoding by buffer-local/global variables
+" groff_compiler_args, groff_compiler_lang, and groff_compiler_encoding,
+" which default to '', &spelllang and 'utf8'.
+
+if exists("current_compiler")
+  finish
+endif
+
+let s:keepcpo = &cpo
+set cpo&vim
+
+let current_compiler = 'groff'
+
+silent! function s:groff_compiler_lang()
+  let lang = get(b:, 'groff_compiler_lang',
+      \ &spell ? matchstr(&spelllang, '^\a\a') : '')
+  if lang ==# 'en' | let lang = '' | endif
+  return empty(lang) ? '' : '-m'..lang
+endfunction
+
+" Requires output format (= device) to be set by user after :make.
+execute 'CompilerSet makeprg=groff'..escape(
+    \ ' '..s:groff_compiler_lang()..
+    \ ' -K'..get(b:, 'groff_compiler_encoding', get(g:, 'groff_compiler_encoding', 'utf8'))..
+    \ ' '..get(b:, 'groff_compiler_args', get(g:, 'groff_compiler_args', ''))..
+    \ ' -mom -T$* -- %:S > %:r:S.$*', ' \|"')
+" From Gavin Freeborn's https://github.com/Gavinok/vim-troff under Vim License
+" https://github.com/Gavinok/vim-troff/blob/91017b1423caa80aba541c997909a4f810edd275/compiler/troff.vim#L39
+CompilerSet errorformat=%o:<standard\ input>\ (%f):%l:%m,
+			\%o:\ <standard\ input>\ (%f):%l:%m,
+			\%o:%f:%l:%m,
+			\%o:\ %f:%l:%m,
+			\%f:%l:\ macro\ %trror:%m,
+			\%f:%l:%m,
+			\%W%tarning:\ file\ '%f'\\,\ around\ line\ %l:,%Z%m
+
+let &cpo = s:keepcpo
+unlet s:keepcpo