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# Update shipped third party resources
## Eigen
In Eigen, we have adapted `SparseLU` to work with scalar types that do not default construct from a double (like CLN numbers) or that do not have an operator< or std::abs
To update the Eigen version, just change the corresponding commit hash in `$STORM_DIR/resources/3rdparty/CmakeLists.txt`.Check whether the patch located at `$STORM_DIR/resources/3rdparty/patches/eigen.patch` can be applied without issues (in particular check for changes in `Eigen/src/SparseLU/`)
In case a new patch needs to be created follow these steps:
1. Clone `https://gitlab.com/libeigen/eigen.git` to `$STORM_DIR/resources/3rdparty/` and checkout the corresponding commit2. Checkout a new branch3. Apply the old patch via `git apply $STORM_DIR/resources/3rdparty/patches/eigen.patch`4. Resolve issues, make changes, and commit them5. Create a new patch file via `git format-patch <tag> --stdout > eigen.patch`, where `<tag>` is the tag, branch or commit from step 1
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