Using pkconfig

[David Simas <dsimas%imageworks.com@localhost>]

The package net/ORBit2 (2.14.3) fails to build on my Linux x86_64 system
(CentOS 4.1), reporting the error

        ../../../src/idl-compiler/orbit-idl-2: symbol lookup error: 
../../../src/idl-compiler/orbit-idl-2: undefined symbol: g_option_context_new

(I'm guessing the symbol "g_option_context_new" comes from glib.).  The
package does build on the i386 version of the OS.  I can also successfully
build ORBit2 on the x86_64 host outside of pkgsrc by explicitly setting
the PKG_CONFIG_PATH environment variable to

        <LOCALBASE>/lib64/pkgconfig:<LOCALBASE>/lib/pkgconfig

So I think there's something amiss in net/ORBit2's use of pkgconfig.
Setting PKG_CONFIG_PATH as above before a "bmake" doesn't fix the error.

Is there any information available on using pkconfig in pkgsrc?

DGS