Your guifont valid for Windows only. In GTK GVim you want:
set guifont=Bitstream\ Vera\ Sans\ Mono\ 11
Alternatively, you can use set guifont=* to open the system dialog to select a font, and then look at the contents of this parameter with set guifont? .
GVim loads .vimrc and then .gvimrc , so you can separate the settings that .gvimrc only to the GUI version.
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