You can do pretty much the same trick - download the library you're after from the repo (http://repo.opkg.net/edison/repo/core2-32/), unpack the ipk file (7-Zip works fine), then put the unpacked files into the respective directories in the cross-toolchain sysroot (you'll see the same directories as in the ipk file by browwing the dir where you installed the toolchain).
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