SPEC file that builds GRASS GIS 7.0.3 rpm package for Centos 6
GRASS GIS, commonly referred to as GRASS (Geographic Resources Analysis Support System), is a free and open source Geographic Information System (GIS) software suite used for geospatial data management and analysis.
Building and installing GRASS GIS requires enabled EPEL-repository
yum install -y epel-release
Also required gdal-1.11 package not available on centos6. You may take in from github