Blame README.packaging

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If you wish to package MakeMaker in a binary package, here's some tips.
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tl;dr version:
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1a) Set the BUILDING_AS_PACKAGE environment variable to a true value.
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OR
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1b) Set the $BUILDING_AS_PACKAGE variable in the Makefile.PL to true.
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2)  Package normally, but watch out for dependency loops.
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MakeMaker cannot have any dependencies, everything depends on it and
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that would be a dependency loop.  It instead bundles pre-built copies
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of all its non-core dependencies in the bundled/ directory.  It adds
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them to itself if they're not already installed.
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This can confuse packagers, it makes it look like MakeMaker contains a
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lot more modules than it really does and causes conflicts.
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You can tell MakeMaker not to use its bundles and instead declare the
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dependencies normally.  This is done either by setting the
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BUILDING_AS_PACKAGE environment variable to true or by patching the
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Makefile.PL and setting $BUILDING_AS_PACKAGE to true.  On the down
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side, there will be dependency loops which your packaging system will
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have to resolve.