Linux – Need help upgrading curl on CentOS 6

I have a CentOS 6 server that has curl version 7.19.7. For some reason that doesn't support NTLM authentication. I have found this thread on redhat's site: https://bugzilla.redhat.com/show_bug.cgi?id=603783 and it looks like it should be working on 7.20.1-3.

I'm having a really hard time upgrading curl. I have tried:

yum install curl-7.24.0-1.0.cf.rhel6.x86_64.rpm libcurl-7.24.0-1.0.cf.rhel6.x86_64.rpm libssh2-1.3.0-4.fc17.x86_64.rpm c-ares-1.7.5-2.fc17.x86_64.rpm

However I get:

Error: Package: c-ares-1.7.5-2.fc17.x86_64 (/c-ares-1.7.5-2.fc17.x86_64)
           Requires: libc.so.6(GLIBC_2.14)(64bit)
Error: Package: libssh2-1.3.0-4.fc17.x86_64 (/libssh2-1.3.0-4.fc17.x86_64)
           Requires: libc.so.6(GLIBC_2.14)(64bit)
Error: Package: c-ares-1.7.5-2.fc17.x86_64 (/c-ares-1.7.5-2.fc17.x86_64)
           Requires: libc.so.6(GLIBC_2.15)(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

I tried adding glibc and then it wants more dependencies and it keeps going. Is there an easier way to do this? I'm afraid if I keep adding more and more something will eventually just break.

This is the thread that I found out about the curl problem – https://bugzilla.redhat.com/show_bug.cgi?id=603783