store paths with `=' in them (such as /nix/store/chj5wrbmi43zjx77svlr4lgnrqi9pwfy-guile-CPPFLAGS=-DSCM_DEBUG=1-1.9.8.113) broke it.
32LK6HFVX2KAUEY7KMNU7D25TVUW6R7EYRKUPQYBGC5XLZ2B5O7QC
I42G2Z7PKDALZKM526VU253MZORF54KFJ3VNGXVE76LRH2RGNORQC
LVJKRTIK5WOWWAZ454B4DCCGETOIQJK5TLOWMZVNY2B4AEGF2GMAC
$res .= " outPath = " . $build->outpath . ";\n";
$res .= " outPath = " . (escape $build->outpath) . ";\n";