Memory exhaustion on buildsys?

I'm trying to build OCE for EL-6 and it has failed twice. Looking at the error it doesn't give any details: [100%] Building CXX object adm/cmake/TKXDEDRAW/CMakeFiles/TKXDEDRAW.dir/__/__/__/src/XDEDRAW/XDEDRAW.cxx.o cd /builddir/build/BUILD/tpaviot-oce-de78904/build/adm/cmake/TKXDEDRAW && /usr/lib64/ccache/c++ -DTKXDEDRAW_EXPORTS -D_OCC64 -DHAVE_FTGL_NEWER212 -DHAVE_CONFIG_H -DCSFDB -DOCC_CONVERT_SIGNALS -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -O2 -g -fPIC -I/builddir/build/BUILD/tpaviot-oce-de78904/build/build_inc -I/builddir/build/BUILD/tpaviot-oce-de78904/inc -I/builddir/build/BUILD/tpaviot-oce-de78904/src/XDEDRAW -I/builddir/build/BUILD/tpaviot-oce-de78904/drv/XDEDRAW -o CMakeFiles/TKXDEDRAW.dir/__/__/__/src/XDEDRAW/XDEDRAW.cxx.o -c /builddir/build/BUILD/tpaviot-oce-de78904/src/XDEDRAW/XDEDRAW.cxx make[2]: *** [adm/cmake/TKXDEDRAW/CMakeFiles/TKXDEDRAW.dir/__/__/__/src/XDEDRAW/XDEDRAW_Layers.cxx.o] Error 1 make[2]: *** Waiting for unfinished jobs.... make[2]: *** [adm/cmake/TKXDEDRAW/CMakeFiles/TKXDEDRAW.dir/__/__/__/src/XDEDRAW/XDEDRAW_Props.cxx.o] Error 1 make[2]: Leaving directory `/builddir/build/BUILD/tpaviot-oce-de78904/build' make[1]: Leaving directory `/builddir/build/BUILD/tpaviot-oce-de78904/build' make[1]: *** [adm/cmake/TKXDEDRAW/CMakeFiles/TKXDEDRAW.dir/all] Error 2 make: *** [all] Error 2 --- end --- The job log shows and issue but it looks like it happens prior to building: State Changed: setup error: db3 error(12) from dbenv->open: Cannot allocate memory error: db3 error(12) from dbenv->close: Cannot allocate memory error: cannot open Packages database in /var/lib/rpm State Changed: build ERROR: Exception(/var/lib/mock/plague-builder/d4e1f24f717ade8b8739f692d1d2f1e457ac6e14/source/OCE-0.8.0-3.el6.src.rpm) Config(el-6-x86_64-rpmfusion_nonfree) 29 minutes 9 seconds --- end --- It builds fine on a local mock build... Any idea what's going on? Thanks, Richard