Build fails: No rule to make target 'copyright.h', needed by 'all'. Stop.

[yurivict]

===>  Building for harminv-1.4.2
gmake[1]: Entering directory '/usr/ports/science/harminv/work/harminv-1.4.2'
gmake[1]: *** No rule to make target 'copyright.h', needed by 'all'.  Stop.
gmake[1]: Leaving directory '/usr/ports/science/harminv/work/harminv-1.4.2'

Version: 1.4.2
clang-14
FreeBSD 13.1

[topazus]

@yurivict I recently also encountered the build error. maybe you are using ./configure after ./autogen.sh, use ./configure --enable-maintainer-mode instead. see:
https://github.com/NanoComp/libctl/blob/069e736614d86d070ce9bfc222c995c818f24191/autogen.sh#LL1C1-L10C42