[plt-scheme] planet & native extension flags?

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Is there an easy way to force planet to use particular flags when  
building extensions?  For example, I'd like to build the sqlid.plt  
libraries, but it can't easily find my PostgreSQL installation -- but  
I don't see how to tell it where to find it (without creating links  
to the appropriate directories).

Am I missing something from the manual?

Thanks,

- -Brent
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