Install SpiderMonkey on AWS

you may need to add a yum repository. Add rpmforge.repo in /etc/yum.repos.d containing:

# Name: RPMforge RPM Repository for Red Hat Enterprise 5 - dag
# URL: http://rpmforge.net/
[rpmforge]
name = Red Hat Enterprise $releasever - RPMforge.net - dag
baseurl = ftp://ftp.pbone.net/mirror/atrpms.net/el5-i386/atrpms/stable
enabled = 1
protect = 0
gpgcheck = 0

(Put "x86_64" instead of "i386" if when appropriate.)

Now run:

yum clean all
yum install js-devel (--skip-broken)