I downloaded the BLAS source from here (click the "blas.tgz" link under the section "Reference BLAS Verstion 3.5.0"), and built it using the instructions given on the post linked above
gfortran -shared -O2 *.f -o libblas.so -fPIC
As suggested by that post, pointing the configure script to the lapack build at /usr/lib64/liblapack.so.3 didn't work. Instead, it required to download the "atlas" package from the yum repos, and point the configure script to the lapack library provided with it.
A couple of additional steps were required to resolve some problems with the configure script. Namely, I had to install the readline-devel package and the qt-devel package (to allow building of the gui). The command for configuration finally was
./configure --with-blas=/home/user123/BLAS/libblas.so --with-lapack=/usr/lib64/atlas/liblapack.so.3
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