How to locate Alien/Package/Deb.pm?

Try to install alien without root. 1. cd /tmp; mkdir alien; cd alien 2. yumdownloader --destdir ./ --resolve alien 3. for rpm in glob.glob("*.rpm"): rpm2cpio rpm | cpio -id 4. cd usr; export PATH=./bin:./sbin:${PATH}; export LD_LIBRARY_PATH=./lib:./lib64:${LD_LIBRARY_PATH} 5. run ./alien, got below error: Can't locate Alien/Package/Deb.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at ./bin/alien line 295. BEGIN failed--compilation aborted at ./bin/alien line 295. I can find Deb.pm. -> find ./ -name 'Deb.pm' ./usr/share/perl5/vendor_perl/Alien/Package/Deb.pm Not sure how to make it locate Alien/Package/Deb.pm