janbrus/normarc2rdf — comment on commit 2599713df26a0bad23388760f911bc1e1482b6dc
File:  line 0
By bensinober:

Ah,didn't realize that! I use Ruby version manager to install ruby, and it probably includes ruby-dev.
For rdf-xml you also need, as stated in readme:
rdf-rdfxml.rb (requires development libraries libxml2 and libxslt1)
in Ubuntu:
sudo apt-get install libxml2-dev libxslt1-dev