Rebuild stops at:
| $ rpm --rebuild perl-libwww-perl-5.63-7.src.rpm
| Note that you can avoid these questions by passing
| the '-n' option to 'Makefile.PL'.
| Do you want to install lwp-request? [y]
where it requires user-input. The comment suggests that passing '-n' to the
Makefile.PL can fix it.
this is fixed in the latest internal build. you can fix it by putting a "<
/dev/null" on the perl Makefile.PL line, or wait until it percolates to rawhide.