/usr/share/texlive/texmf-dist/metapost/dviincl/fix_page.mp is in texlive-metapost 2014.20141024-2+deb8u1.
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1 2 3 4 5 6 7 | vardef fix_page (expr p_,f_) =
save selected_page; selected_page=p_;
save setbounds; def setbounds text t = enddef; % we'd better ignore it
scantokens ("input " & f_)
enddef;
endinput
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