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On VAX/VMS and ALPHA/VMS systems the make_gfloat.com command file may be executed to build the cfitsio.olb object library using the default G-floating point option for double variables. The make_dfloat.com and make_ieee.com files may be used instead to build the library with the other floating point options. Note that the getcwd function that is used in the group.c module may require that programs using CFITSIO be linked with the ALPHA$LIBRARY:VAXCRTL.OLB library. See the example link line in the next section of this document.