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As of version 0.8.9, gcx uses vizquery to obtain stars from the "big"
catalogs (USNO-B, UCAC2, GSC2, GSC-ACT) from the Centre de Donnes
astronomiques de Strasbourg, France.
To install vizquery, download the cdsclient package from
ftp://cdsarc.u-strasbg.fr/cats/cdsclient.tar.gz
and install it using the instructions from
http://cdsweb.u-strasbg.fr/devcorner.gml
(which basically say: ./configure; make; make install)
If the binaries from cdsclient are not installed in the command path,
the "Online Catalogs/Vizquery command" gcx option should be set to the
full path name to vizquery. It is also possible to append vizquery
options to this command, the most useful being "-site=<site>" to specify
a CDS mirror.
Note that the "wwwget" program in some versions of cdstools has a
problem causing it to segfault if the /etc/resolv.conf file does not
contain a "search" or "domain" line. To fix this, change line 257 in
wwwget.c (in function gethostname) from
if (*domain) {
to
if (domain && *domain) {
and rebuild cdstools.
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