vim doesn't find files when compiling under scons

Hello,

I am using scons inside vim via makeprg, and have an issue with vim
not finding files during quickfix. Specifically, say the project root
is ~/root and file ~/root/a/b.cpp is broken. Running scons produces
the error message

a/b.cpp|1607| instantiated from here
...

If I open vim from inside ~/root/a (or a different directory), typing
:cn to jump to that error doesn't open b.cpp. This is true even if
path includes ~/root (path as in ":set path=...").

How can I teach vim to search for files underneath ~/root?

Thanks!
Geoffrey

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