RHEL 5.5 Upgrade gcc from 4.1.2 to gcc 4.4

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I am working on a legacy RHEL 5.5 embedded system, and in order to link with a third party library I need to upgrade compiler to gcc 4.4.

Yum tells me the packages are available

root$ yum list all | grep gcc
gcc.x86_64                                4.1.2-50.el5            installed
gcc-c++.x86_64                            4.1.2-50.el5            installed
gcc44.x86_64                              4.4.7-11.el5_11         installed
libgcc.i386                               4.1.2-50.el5            installed
libgcc.x86_64                             4.1.2-50.el5            installed
gcc.x86_64                                4.1.2-55.el5            res5-x86_64
gcc-c++.x86_64                            4.1.2-55.el5            res5-x86_64
gcc-debuginfo.i386                        4.1.2-55.el5            res5-x86_64
gcc-debuginfo.x86_64                      4.1.2-55.el5            res5-x86_64
gcc-gfortran.x86_64                       4.1.2-55.el5            res5-x86_64
gcc-gnat.x86_64                           4.1.2-55.el5            res5-x86_64
gcc-java.x86_64                           4.1.2-55.el5            res5-x86_64
gcc-libraries-debuginfo.i386              4.8.0-5.1.1.el5         res5-x86_64
gcc-libraries-debuginfo.x86_64            4.8.0-5.1.1.el5         res5-x86_64
gcc-objc.x86_64                           4.1.2-55.el5            res5-x86_64
gcc-objc++.x86_64                         4.1.2-55.el5            res5-x86_64
gcc43.x86_64                              4.3.2-7.nv5.3           res5-x86_64
gcc43-c++.x86_64                          4.3.2-7.nv5.3           res5-x86_64
gcc43-gfortran.x86_64                     4.3.2-7.nv5.3           res5-x86_64
gcc44-c++.x86_64                          4.4.7-11.el5_11         res5-x86_64
gcc44-debuginfo.i386                      4.4.7-11.el5_11         res5-x86_64
gcc44-debuginfo.x86_64                    4.4.7-11.el5_11         res5-x86_64
gcc44-gfortran.x86_64                     4.4.7-11.el5_11         res5-x86_64
libgcc.i386                               4.1.2-55.el5            res5-x86_64
libgcc.x86_64                             4.1.2-55.el5            res5-x86_64

And so I installed them

root$ yum install gcc44.x86_64 gcc44-c++.x86_6

but my gcc version is still 4.1.2

root$ gcc --version
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-50)

What did I miss?

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