Commit 7666e73a introduced a dependency on filehandles' input_line_number
method, but apparently that's a Perl neologism.  Use $. instead, which
works at least back to Perl 5.10, and hopefully back to 5.8.

Jeff Janes

Discussion: https://postgr.es/m/CAMkU=1wuQW=xVfu-14A4VCvxO0ohkD3m9vk6HOj_dprQoKNAQw@mail.gmail.com