The CRAN packages abnormality and ABC.RAP give errors (among 50 packages I tried):
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 45: ordinal not in range(128)

The bytecode differs for both. The DESCRIPTIONs look quite innocent.

The command line was:
R2rpm --verbose --debug --no-check --no-suggest -p $package

48 other packages worked flawless.

Here is the traceback for ABC.RAP

INFO:R2spec:Filling spec variable from info collected
INFO:R2spec:Filling spec template
Traceback (most recent call last):
File "/usr/bin/R2rpm", line 29, in
R2rpm().main(ARG)
File "/usr/lib/python2.7/site-packages/r2spec/r2spec_obj.py", line 363, in main
self.pack = super(R2rpm, self).main(args)
File "/usr/lib/python2.7/site-packages/r2spec/r2spec_obj.py", line 286, in main
spec.get_template()
File "/usr/lib/python2.7/site-packages/r2spec/spec.py", line 233, in get_template
self.spec = mytemplate.render(self.__dict)
File "/usr/lib/python2.7/site-packages/jinja2/environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "/usr/lib/python2.7/site-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "