During an upgrade to openssl-1.1.1 I noticed that a preserved-rebuild event was triggered for net-misc/sipsak. That's because /usr/bin/sipsak links against libcrypto.so provided by OpenSSL: # lddtree /usr/bin/sipsak /usr/bin/sipsak (interpreter => /lib64/ld-linux-x86-64.so.2) libcrypto.so.1.1 => /usr/lib64/libcrypto.so.1.1 libdl.so.2 => /lib64/libdl.so.2 libpthread.so.0 => /lib64/libpthread.so.0 libcares.so.2 => /usr/lib64/libcares.so.2 libc.so.6 => /lib64/libc.so.6 The funny thing is, that I have USE=gnutls set but gnutls isn't used?!
https://github.com/nils-ohlmeier/sipsak/commit/1bfa38e3a9c64ac3aa9f57f7f50eedec6c760c1a ... and various other fixes.