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The build system uses the CrossCompiling variable to decide whether or not we should build various packages that must be built using the compiler. Consequently, it is important that we persist its value in the binary distribution so we know during `make install` not to go looking for files that would have been built for these packages. Failing to do this causes #13325. Test Plan: Cross compile, `make binary-dist`, and try installing the binary distribution on the target Reviewers: hvr, austin, trofi, rwbarton Reviewed By: trofi, rwbarton Subscribers: carter, trofi, rwbarton, erikd, thomie, snowleopard, davean Differential Revision: https://phabricator.haskell.org/D3187
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