diff -up ncl-6.6.2/ni/src/ncl/yMakefile.gdal ncl-6.6.2/ni/src/ncl/yMakefile
--- ncl-6.6.2/ni/src/ncl/yMakefile.gdal 2019-02-27 16:44:39.000000000 -0700
+++ ncl-6.6.2/ni/src/ncl/yMakefile 2020-07-17 21:53:50.743277471 -0600
@@ -198,14 +198,14 @@ EXTRA_CLDFLAGS = $(DEV_LIB_SEARCH) $(EXT
#endif
#if defined(SUN)
-# EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GDALLIB) $(GRIDSPECLIB) $(UDUNITSLIB) $(V5DLIB) $(GRIB2LIB) $(PNGLIB) $(CAIROLIB) $(SPHERELIB) $(FFTPACK5LIB) -fast -xlic_lib=sunperf -lnsl -lintl -lsocket -ldl -lw -lfui
-EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(GRIB2LIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS) -lnsl -lintl -lsocket -ldl -lw
+# EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GRIB2LIB) $(GDALLIB) $(GRIDSPECLIB) $(UDUNITSLIB) $(V5DLIB) $(PNGLIB) $(CAIROLIB) $(SPHERELIB) $(FFTPACK5LIB) -fast -xlic_lib=sunperf -lnsl -lintl -lsocket -ldl -lw -lfui
+EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GRIB2LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS) -lnsl -lintl -lsocket -ldl -lw
#elif defined(AIX)
-EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(GRIB2LIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS) -lxlf90 -lxlopt
+EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GRIB2LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS) -lxlf90 -lxlopt
#elif (defined(IRIX) || defined(IRIX64))
-EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(GRIB2LIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS)
+EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GRIB2LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS)
#else
-EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(GRIB2LIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS)
+EXTRA_LIBS = $(NCDFLIBS) $(HDFEOS5LIB) $(NETCDF4LIB) $(HDFEOSLIB) $(HDFLIB) $(HDF5LIB) $(GRIB2LIB) $(GDALLIB) $(GRIDSPECLIB) $(OpenCLLIB) $(UDUNITSLIB) $(V5DLIB) $(PNGLIB) $(CAIROLIB) $(EEMDLIB) $(EXTERNALLIBS)
#endif
SYS_LIBS = $(XLIB) $(CTOFLIBS) -lm $(ARCH_LIBS) $(DYNAMIC_LIBS)