libxml2.so.2 missing from ubuntu 25.10 causes c3c to error

[thomasblakelycloudwave]

$ c3c compile hello.c3 
c3c: error while loading shared libraries: libxml2.so.2: cannot open shared object file: No such file or directory

fix identified

thomas@sterling:~/Documents/development/c3/hello$ sudo ldconfig -p | grep libxml
	libxml2.so.16 (libc6,x86-64) => /lib/x86_64-linux-gnu/libxml2.so.16
	libxml2.so.16 (libc6) => /lib/i386-linux-gnu/libxml2.so.16
	libxml2.so (libc6,x86-64) => /lib/x86_64-linux-gnu/libxml2.so
	libxmlb.so.2 (libc6,x86-64) => /lib/x86_64-linux-gnu/libxmlb.so.2
thomas@sterling:~/Documents/development/c3/hello$ sudo ln -s /lib/x86_64-linux-gnu/libxml2.so.16 /lib/x86_64-linux-gnu/libxml2.so.2

and working:

thomas@sterling:~/Documents/development/c3/hello$ c3c compile hello.c3 
c3c: /lib/x86_64-linux-gnu/libxml2.so.2: no version information available (required by c3c)
c3c: /lib/x86_64-linux-gnu/libxml2.so.2: no version information available (required by c3c)
Program linked to executable './hello'.
thomas@sterling:~/Documents/development/c3/hello$ 

reference: https://discourse.ubuntu.com/t/psa-ubuntu-25-10-features-a-libxml2-version-with-api-breaking-changes/71783

i am raising this as perhaps it is worth noting somewhere. this is likely affecting multiple distros (i tested on debian and no issue

[lerno]

This is a problem with the llvm library which is built with libxml, which we don't need actually. I've been experimenting with this fork: https://github.com/lerno/llvm-custom-builds to get our own llvm builds that don't have these issues.