This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
If your goal is to display or process data with GEMPAK, then you will want to install the LDM. The GEMPAK installation includes realtime data decoders which work with the LDM to decode data into GEMPAK format as it arrives over the LDM. You'll want to refer to the LDM web pages for the installation of LDM. Examples of LDM pqact.cont pattern/action entries for the various types of data for the GEMPAK decoders can be found in the tutorial as well as in the Examples section of the GEMPAK pages. Some useful links: GEMPAK Installation Instructions: http://www.unidata.ucar.edu/software/gempak/GEMPAK5.11/Install_GEMPAK5.11.html Configuring the GEMPAK decoders with the LDM: http://www.unidata.ucar.edu/software/gempak/GEMPAK/configuration.html Installing, Configuring, and Activating the LDM http://www.unidata.ucar.edu/software/ldm/ldm-6.7.0/basics/index.html#installation GEMPAK Tutorial: Decoding Data http://www.unidata.ucar.edu/software/gempak/tutorial/decoders2.html > Thanks Michael, > I could build GemPak successfully with the latest 5.11.4 version. While > setting up I could see "LDM" associations. > One small question, am I supposed to install LDM before GemPak? > Regards > > > address@hidden> wrote: > > > > > Akhilesh, > > > > The 64-bit GEMPAK 5.11.1 binary distribution was built on a Fedora 8 > > machine (using gfortran, not g77). We very often receive support requests > > directly related to the use of a pre-compiled binary distribution. In many > > cases, the problems that were being reported went away when GEMPAK was built > > from source on the user's machine. For this reason, I strongly suggest you > > build the current release from source, 5.11.4 unless your machine is > > identical to the machines on which we produced the 5.11.1 binary. The only > > alternative I can suggest is to reinstall a version of OpenMotif that > > matches what is expected by the binary, but I believe building 5.11.4 from > > source on your machine is the best solution. > > > > Michael James > > Unidata User Support > > > > > > > > > Hi Michael, > > > Just finished installing LessTif in /usr/local > > > still getting same problem > > > > > > airsea:/home/gempak$ ntl > > > ntl: Symbol `_XmStrings' has different size in shared object, consider > > > re-linking > > > Resource File: /home/gempak/GEMPAK5.11.1/resource/Ntop > > > graphic, satellite, radar, fax -- 33 95 20 2 > > > > > > and every time I click on nmap2, ntrans, nwx...I get these warnings > > > > > > Warning: Cannot find callback list in XtAddCallback > > > Warning: Cannot find callback list in XtAddCallback > > > Warning: Cannot find callback list in XtAddCallback > > > Warning: Cannot find callback list in XtAddCallback > > > .................. > > > .................. > > > ...... > > > ..... > > > > > > Please suggest. > > > Akhilesh > > > > > > address@hidden> wrote: > > > > > > > > Many Thanks Michael, > > > > > > > > > > 3) how did you install the LessTif package? > > > > > > > > > > Answer: No I didn't install LessTif, I just searched and found that > > > > LessTif > > > > > is not installed. > > > > > > > > > > airsea:/home/gempak$ rpm -q LessTif > > > > > package LessTif is not installed > > > > > > > > > > > > > There we go. Try to install the LessTif package and let me know if the > > > > errors disappear. > > > > > > > > -Michael > > > > > > > > Ticket Details > > > > =================== > > > > Ticket ID: KNS-858857 > > > > Department: Support GEMPAK > > > > Priority: Normal > > > > Status: Open > > > > > > > > > > > > > > > > > > > > Ticket Details > > =================== > > Ticket ID: KNS-858857 > > Department: Support GEMPAK > > Priority: Normal > > Status: Open > > > > > > Ticket Details =================== Ticket ID: KNS-858857 Department: Support GEMPAK Priority: Normal Status: Open