The ncview program is a simple utility that prints the contents
of a netCDF-format file to standard output. This section outlines the
process used to modify the ncview makefile to link that program
with the OPeNDAP netCDF API, thereby turning ncview into a
network-ready OPeNDAP client. The process of linking any other program
with the corresponding OPeNDAP library is entirely analogous to this one
and only requires the substitution of the program name and the
appropriate library.
First the link flags were modified so that the library search path would include the likely places to find the OPeNDAP libraries:
LDFLAGS = -g -L$(DODS_ROOT)/lib
DODS_ROOT is an environment variable that indicates the root
directory of the OPeNDAP installation, and in this manual is used as
shorthand for this directory. It is typically called something like
/usr/local/DODS. If you cannot find these directories on your
system, consult your system administrator, or refer to
Appendix A for information about acquiring and installing
the OPeNDAP software.
After the link flags were modified, the OPeNDAP libraries were added to the list of libraries used. The order in which the libraries are listed is important.
LIBS = -lnc-dods -ldap++ -lnc-dods -ldap++ -lwww -ltcl
-lexpect -lz -lrx
NOTE: Because OPeNDAP is implemented as a core set of classes contained in one
library (libdap++.a) and a set of specializations of those classes in a
second library (libnc-dods.a), and because there is a circular
dependence between those two libraries, they must be included twice in the
linker command.
Finally, g++ was substituted for the link command.9