The Gnu Data Language (GDL) is a useful open-source alternative to IDL on Linux. Although for new astronomical scripting applications we prefer Python, the proprietary IDL system is widely used and there are many astronomical routines written for it that are freely available. This page is a guide to the installation of GDL on an OpenSuse Linux platform.
Download the recent source code
We assume that the base OpenSuse system has been installed with the packages that are often used to support scientific computing. There are some unusual dependencies to build a complete GDL. Additional procedures may be added after the fact since they are compiled as needed by GDL itself.
We recommend installing the version in the CVS repository since is likely to have many known issues corrected. However, the version 0.9.2 released on 2012-02-20 will compile and is largely compatible with IDL. These notes are based on an CVS verion of 2012-07-29 which updates that release.
Go to the Sourceforge website:
and click on the "Code" link in the top menubar rather than the "Download" button that provides the last stable release. At the bottom of the new "gdl" listing there will be an option to download the GNU tar archive of the entire CVS tree. Once you have it on your system, make a copy in a permanent location, and as superuser (su), also to the /usr/local/src tree on your Linux system:
cp gnudatalanguage-gdl_20120729.tar.gz /usr/local/src
You are ready to compile the code.
Install and compile the source code
The source tree will be in /usr/local/src/ where you made a copy of the downloaded tarfile:
tar xvzf gnudatalanguage-gdl_20120729.tar.gz
This will create a "gdl" directory in /usr/local/src containing the files you will compile.
./configure --without-hdf --with-hdf5
If the configuration does not successfully complete and create "Makefile" in the top level directory, look at the list of errors generated during configuration for clues about missing packages. There will distinctive name that you will have to find in the distribution's repositories. For OpenSuse, you would use yast or yast2 as indicated, then repeat the configure command and the search for rpm's until there are no errors.
Once those issues are resolved, try building the software with
We find that during the build you may see an error such as this one:
libtool: Version mismatch error.
which is corrected by running this command
aclocal; libtoolize --force; autoconf; automake -a
in the toplevel of gdl directory, and then repeating the configure and make commands.
The GDL team notes in their CVS version that they will be using cmake instead of autoconf in the future. The software can be compiled with cmake once you install the package for your distribution. The process would be something like this:
modified to allow for variations in your installation requirements. Instructions are in the gdl INSTALL.cmake file.
After a successful make operation, install the binaries and library with
Prepare a location for the procedures that you will add:
cp -p -r /usr/local/src/gdl/src/pro ./
Add new procedures
For astronomical use, there are additional procedures to install system-wide. Download and save in your long term archive the code from these sites:
- Craig Markwardt's CMSVLIB is needed for SAVE and RESTORE in GDL
- NASA's astronomy library or the ftp site provides many astronomical utility procedures and handlers for FITS files
- Mark Buie's IDL libary and download site provides procedures for astrometry, photometry, and spectroscopy
- Matthew Craig's tex to IDL provides procedures to use LaTeX markup coding in graphics
Copy the .pro files from these sources into one or more separate directories undier /usr/local/gdl. For example, we would use something like this:
cp /home/john/gdl/archive/astron.tar.gz ./
tar xvzf astron.tar.gz
cp *.pro /usr/local/gdl/astro/
rm -r tmp
and repeat this for each of the libraries you want to add, copying only the *.pro files into gdl. They can all go into gdl/astro, or if you anticipate updating them individually, into a separate directory for each one.