SVN r12448 (couldn't find the 20.03 release source; your instructions were to grab trunk from svn)
Bug in src/plugins/contrib/wxSmith/wxwidgets/defitems/Makefile: line 1445, missing delimiter
Fix: In section .PRECIOUS, add tabs in front of the header files listed.
The weird thing is that this was generated from automake 1.16.1.
System = MX Linux 19.04, Debian-based, non-systemd boot
The build command was:
./configure --with-contrib-plugins="all" --enable-fortran --disable-dependency-tracking
This has been discussed in the forum and will be fixed soon.
fixed in r12449