Compiling SAGE 5.5 -- Matplot Lib Fails to find Numpy

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I'm currently compiling SAGE 5.5 and running in to the following errors (from the install.log):

68513 ==========================================================================      ==
68514 BUILDING MATPLOTLIB
68515             matplotlib: 1.1.0
68516                 python: 2.7.3 (default, Jan  7 2013, 11:22:35)  [GCC 4.4.6
68517                         20120305 (Red Hat 4.4.6-4)]
68518               platform: linux2
68519 
68520 REQUIRED DEPENDENCIES
68521                  numpy: no
68522                         * You must install numpy 1.1 or later to build
68523                         * matplotlib.
68524 Error building matplotlib package.

However, if I check the installation of numpy in install.log, I see the following:

63222 Successfully installed numpy-1.5.1.p1

Why is matplotlib not finding numpy? Is there a way of forcing the path? This seems like something that should "Just Work".

My build process:

1. Untar sage-5.5
2. cd sage-5.5
3. make

ADDENDUM:

I've included a bit more debugging information, some things removed for privacy sake. CPU: Intel(R) Xeon(R) CPU W3530 @ 2.80GHz Memory: 12GB Operating System: RHEL 6 Kernel: 2.6.32-279.19.1.el6.x86_64

Compiler:

Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man 
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla 
--enable-bootstrap --enable-shared --enable-threads=posix 
--enable-checking=release --with-system-zlib --enable-__cxa_atexit 
--disable-libunwind-exceptions --enable-gnu-unique-object 
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk 
--disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre 
--enable-libgcj-multifile --enable-java-maintainer-mode 
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib 
--with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 
--build=x86_64-redhat-linux
Thread model: posix
gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC)

Environmental Variables:

MALLOC_CHECK_=1
SHELL=/bin/bash
TERM=screen
HISTSIZE=1000
QTDIR=/usr/lib64/qt-3.3
QTINC=/usr/lib64/qt-3.3/include
SSH_TTY=/dev/pts/0
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