diff --git a/devel-docs/c.vim b/devel-docs/c.vim
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+" GIMP coding style for vim "
+
+" To enable these vim rules for GIMP only, add this command to your vimrc:
+" autocmd BufNewFile,BufRead /path/to/gimp/*.[ch] source /path/to/gimp/devel-docs/c.vim
+"
+" Do not use `set exrc` which is a security risk for your system since vim may
+" be tricked into running shell commands by .vimrc files hidden in malicious
+" projects (`set secure` won't protect you since it is not taken into account
+" if the files are owned by you).
+
+" GNU style
+setlocal cindent
+setlocal cinoptions=>4,n-2,{2,^-2,:2,=2,g0,h2,p5,t0,+2,(0,u0,w1,m1
+setlocal shiftwidth=2
+setlocal softtabstop=2
+setlocal textwidth=79
+setlocal fo-=ro fo+=cql
+
+" Tabs are always inserted as spaces.
+set expandtab
+" But if there are tabs already, show them as 8 columns.
+setlocal tabstop=8
+
+" Highlight in red trailing whitespaces and tabs everywhere.
+highlight TrailingWhitespace ctermbg=LightRed guibg=LightRed
+match TrailingWhitespace /\s\+$/
+highlight ForbiddenTabs ctermbg=DarkRed guibg=DarkRed
+2match ForbiddenTabs /\t/