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Problem Description:

I have been working with an earthquake model that involves a curved fault. When I attempt to run the "poly3d-inv -i inv.in" command to perform inversion analysis, I encounter an error (cannot calc element normal. Elt must have avery odd shape, and I am unsure about the root cause of this issue. The following are key aspects of the problem:

1. The earthquake model comprises two faults. One of these faults is considerably larger and curved, while the other fault is oriented nearly east-west.
2. When I execute the "poly3d-inv -i inv.in" command on a single segment of the fault, it runs successfully without any errors. However, when I attempt to run the same command on all the segments simultaneously, the error is triggered
3. My operating system environment is a virtual machine running "Windows XP."

This doesn't seem to build with me for contemporary (2023) versions of gcc on ubuntu.

However, this little shell script uses docker to build a container with gcc 4.8, build poly3d, and write the compiled binary back to the local file system:

#!/bin/bash
git clone https://github.com/stgl/poly3d.git
cd poly3d
docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp gcc:4.8 make

The created poly3d runs fine (ubuntu 22).