There are a few more issues for CentOS 5.
The elf.h header is missing some newer relocation types, e.g. R_X86_64_PC64.
Phobos is linking against libcurl.so.4, but only .so.3 is available.
So if you're still interested in fixing those, please contribute :).
Comment #5 by pro.mathias.lang — 2020-01-16T14:03:11Z
Glibc 2.8 was released in April 2008: https://sourceware.org/ml/libc-alpha/2008-04/msg00050.html
CentOS 5 went EOL on 2017-03-31.
Closing this as WONTFIX. Patches for supporting older platforms are welcome, but I don't think anyone going through the bug is going to tackle this.