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+# The problem
+
+Some projects require newer C++ standards to build them. To keep the glibc dependency low you can
+build a newer GCC version on an older distro and use it to compile the project.
+This project however will now require a newer version of the `libstdc++.so.6` library than available on that distro.
+Bundling `libstdc++.so.6` however will in most cases break compatibility with distros that have a newer library
+version installed into their system than the bundled one. So blindly bundling the library is not reliable.
+
+By the way, while this is primarily an issue with `libstdc++.so.6` in some rare cases this might also occur with `libgcc_s.so.1`.
+That's because both libraries are part of GCC.
+
+
+# The solution
+
+You would have to know the library version of the host system and decide whether to use a bundled library or not before the
+application is started. This is exactly what the patched AppRun binary does.
+It will search for `usr/optional/libstdc++/libstdc++.so.6` and `usr/optional/libgcc_s/libgcc_s.so.1` inside the AppImage or AppDir.
+If found it will compare their internal versions with the ones found on the system and prepend their paths to `LD_LIBRARY_PATH`
+if necessary.