# %& magic line has no effect

I am using the %&format magic line in a plain TeX file. On older versions of TeX the result produces the expected results. On TeXLive 2009 (under Gentoo), however, this line has no effect. When I use 'tex -fmt format.fmt file.tex' the expected font substitutions nevertheless work. Has the magic file feature to be enabled in some config file? Many thanks.

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I don't know about Gentoo, but this is controlled by the `parse_first_line` option. For me, it lives in `/.../texlive/2010/texmf/web2c/texmf.cnf`. That said, changes should go in `/.../texlive/2010/texmf.cnf`:

``````parse_first_line = t
``````
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or use command line option [-no]-parse-first-line –  Martin Heller Oct 20 '10 at 22:37