doc: include short docs about bmake

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doc
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doc/hooks/bmake.section.md
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# bmake {#bmake-hook}
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[bmake](https://www.crufty.net/help/sjg/bmake.html) is the portable variant of
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NetBSD make utility.
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In Nixpkgs, `bmake` comes with a hook that overrides the default build, check,
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install and dist phases.
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doc/hooks/index.md
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autoconf.section.md
automake.section.md
autopatchelf.section.md
breakpoint.section.md
cmake.section.md
gdk-pixbuf.section.md
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autoconf.section.md
automake.section.md
autopatchelf.section.md
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bmake.section.md
breakpoint.section.md
cmake.section.md
gdk-pixbuf.section.md