PrBoom supports PNG screenshots on Linux since version 2.4.1 (and in GL
mode since 2.4.5), provided it is built against libpng, otherwise output
is in the BMP file format.
For architectures other than ia64 on Squeeze, prboom is not built
against libpng. The version currently available in unstable does write
PNG screenshots.
I can confirm that prboom is built with support for PNG screenshots
and that it saves in this format by default. Regarding the build,
libpng12-dev is currently pulled in by libdirectfb-dev, which is in
turn pulled in by libsdl1.2-dev. I admit that's a rather fragile
chain, so maybe libpng-dev should be added as an explicit Build-Depends.
- Fabian
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