Instead of linking to an existing highlight group, you can specify colors (and attributes like bold and italic). See :help highlight-args
for details.
:highlight foo ctermfg=Grey guifg=Grey
Question
When writing a syntax highlighter for vim you can use the following:
highlight link foo Identifier
However, can I use a custom color, say Grey?
La solution
Instead of linking to an existing highlight group, you can specify colors (and attributes like bold and italic). See :help highlight-args
for details.
:highlight foo ctermfg=Grey guifg=Grey