With this twmruined reads .twmruinedrc instead of .twmrc.
Some more details from the Changelog:
* src/twm.h and several other files: remove iconmgr functionality.
Also drop the sample configuration file directory. These referenced
iconmgr settings which I've removed. As more settings go these
files would get further and further from their authors' intentions
if I were to maintain them.
* aclocal.m4: regenerated using aclocal (automake) 1.15.1 on OpenBSD 6.2.
export AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.15.1 ACLOCAL=/usr/local/bin/aclocal-1.15
/usr/local/bin/aclocal-1.15 -I /usr/X11R6/share/aclocal
* configure: regenerated using autoconf 2.69 on OpenBSD 6.2.
