Perforce like client specs mappings with Mercurial

We recently moved from Perforce to Mercurial and love it!

One little problem: after much research we can't figure out how to map a special directory in the repository to some special place on the client. Here is an example of our hg repo:

/foo/source files/bar/source files/build /macosx/mac make files /win/windows make files

With Perforce, we were using client spec mappings to map //depot/build/macosx/... to just /build/... on the Mac client, and //depot/build/win/... to /build/... on the Windows dev box. Directories foo and bar are synced as is. Makefiles in /foo and /bar assume that our build makefiles are located in /build and we would like to keep them as is. The final client set of files should look like this:

/foo/source files/bar/source files/build/client specific make files

I've read about subrepos, but this solution does not seem to be client specific.

Any idea how to solve this problem will be very much appreciated!

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