It seems this was intentional, from debian/changelog:
libxslt (1.1.34-1) experimental; urgency=medium ... * Stop building and installing the static library. ... -- Mattia Rizzolo <mat...@debian.org> Mon, 25 Nov 2019 19:22:08 +0100 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1908500 Title: libxslt.a missing from libxslt1-dev To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libxslt/+bug/1908500/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
