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/usr/share/GNUstep/PostScript/GSProlog.ps is in gnustep-gui-common 0.26.2-3.

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%%LanguageLevel defines
%%
%% Copyright (C) 2005, Free Software Foundation, Inc.
%%
/_GSsetalpha { pop } bind def

/setalpha where
    {pop /GSsetalpha /setalpha load def}
    {/GSsetalpha /_GSsetalpha load def}
  ifelse