Task #8161: update dragnet variants file: force FFTW3 (and CFITSIO and GSL) to...

Task #8161: update dragnet variants file: force FFTW3 (and CFITSIO and GSL) to be used from /usr and not the custom installs from others in /usr/local (NFS).

CMake/variants/variants.dragnet

@@ -12,6 +12,12 @@ set(CUDA_TOOLKIT_ROOT_DIR /opt/cuda-7.0)
 set(CASACORE_ROOT_DIR     /opt/casacore-2.0.1)
 set(DAL_ROOT_DIR          /opt/lofardal-2.5.0)
 
+# Avoid using unnecessary custom installed packages in /usr/local (NFS).
+# This may clash with libs other deps (e.g. casacore) linked to, and deps on NFS (possible latency spike for COBALT).
+set(FFTW3_ROOT_DIR        /usr)
+set(CFITSIO_ROOT_DIR      /usr)
+set(GSL_ROOT_DIR          /usr)
+
 # RHEL/CentOS 7 has openmpi in /usr/lib64/openmpi and mpich in /usr/lib64/mpich
 set(MPI_ROOT_DIR      /usr/lib64/openmpi)