gSystem -> Load(): undefined symbol

When I load a custom built library
gSystem -> Load("/afs/")

I get an error related to the TMatrixTBase class:

undefined symbol: _ZN12TMatrixTBaseIdE4DrawEPKc

Any ideas what is at the heart of this issue?

The output from c++filt _ZN12TMatrixTBaseIdE4DrawEPKc suggests that you first need to: gSystem->Load("libMatrix");

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That solved the problem.

It would be nice if all class references

(such as

referred to additional libraries that need to be loaded.

TMatrixTBase< Element > Class Template Reference

grep TMatrixTBase `root-config --libdir`/*.rootmap
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I am curious what are the files with the extension .rootmap?

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