In netCDF 3.6.1 the –enable-64bit option to configure attempts to build 64-bit versions of the netCDF library. This option was discontinued in the 3.6.2 release. Users are invited to contribute information for the list below. Send successful build information to The following environment variable settings work for us; they are given below as csh commands (sh users take note!). SunOS setenv CFLAGS -m64 setenv CXXFLAGS -m64 setenv FFLAGS -m64 setenv F90FLAGS -m64 IRIX setenv CFLAGS -64 setenv CXXFLAGS -64 setenv FFLAGS -64 setenv F90FLAGS -64 AIX setenv CFLAGS -q64 setenv CXXFLAGS -q64 setenv FFLAGS -q64 setenv F90FLAGS -q64 setenv ARFLAGS -X64 setenv NMFLAGS -X64 HP-UX setenv CFLAGS +DD64 setenv CXXFLAGS +DD64 setenv FFLAGS “+noppu +DA2.0W” setenv F90FLAGS “+noppu +DA2.0W” Formats, Data Models, and Software Releases In different contexts, “netCDF” may refer to a data model, a software implementation with associated application program interfaces (APIs)