Error in top level configure script

[Julian Gilbey]

In teTeX-1.0.7, in the top level configure script, the variable
needs_pnglib is carefully set, but on line 2539, needs_libpng is
referred to instead of needs_pnglib.

   Julian

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         Julian Gilbey, Dept of Maths, Queen Mary, Univ. of London
       Debian GNU/Linux Developer,  see http://people.debian.org/~jdg
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