You can find the following text in README.md:
- The gcc versions are outdated. According the file names of our archives, these were built with gcc 5.3, not gcc 4. Nevertheless, the described build problem still exists when building with gcc 7.4 or 8.3. Please update this.
- AFAIK, our builds of libclang contain a couple of patches which would be missing when using the packages from the distribution. Is it really recommendable to use the distro's version?