The following bug has been logged online:

Bug reference: 1596
Logged by: Guilherme Paiva Santos
Email address: gpaiva (AT) acesso-online (DOT) com.br
PostgreSQL version: 8.0
Operating system: WIndows XP
Description: Bad header in input lib
Details:

When I try to linkedit my C Language program with the lib "libpq", I receive
the error message:

"Bad header in input lib"

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match