or download this
************************************************************
* Initializing cpantorpm (1.08)
...
File not found by glob: /home/fli/rpmbuild/BUILDROOT/perl-App-CPAN
+toRPM-1.08-1.el7.x86_64/usr/share/man/man1/*
File not found by glob: /home/fli/rpmbuild/BUILDROOT/perl-App-CPAN
+toRPM-1.08-1.el7.x86_64/usr/share/man/man3/*
ERR: Unable to execute /usr/bin/rpmbuild: No such file or directory