Rather than adding those four lines to /etc/xpdf/xpdfrc
as suggested by Senthil Kumaran's answer, I created a ~/.xpdfrc
file.
I'm French and I use a Dvorak bépo keyboard, so my ~/.xpdfrc
file includes:
bind c any scrollLeft(16) bind r any scrollRight(16) bind s any scrollUp(16) bind t any scrollDown(16)