Changes between Version 3 and Version 4 of CompilationGuide/Generic

Timestamp:

Dec 23, 2013, 2:31:47 PM (13 years ago)

Author:

Stefano Sabatini

Comment:

add "LD_LIBRARY_PATH and ldconfig" section

CompilationGuide/Generic

@@ -59 +59 @@
 In case you installed a package in a non standard path, you need to update these environment libraries so that system tools will be able to detect the package components. This is especially required when running a configure script for a package relying on other installed libraries/headers/tools. 
 
+Environment variables are usually defined in the profile file, for example {{{.profile}}} defined in the user directory for sh/bash users, and in {{{/etc/profile}}}. You should probably update this file in order to set permanently your custom environment. Alternatively you can set the variables in a script or in a particular shell session.
+
+Remember to export the variables to the child process, e.g. using the {{{export}}} command. Read the fine documentation of your shell for more detailed information.  
+
+== LD_LIBRARY_PATH and ldconfig ==
+
+When you link a library depending on other libraries, the tools will look for the libraries to link in a list of standard paths (typically, {{{/usr/lib}}}, and in other paths which are set in the system. Some systems rely on the {{{LD_LIBRARY_PATH}}} library. Alternatively you may set the global path through the {{{ldconfig}}} utility, which is done editing the {{{/etc/ld.so.conf}}} system configuration file.
+
+Note that on some systems the {{{LD_LIBRARY_PATH}}} variable defined in the shell profile is reset for security reasons (e.g. see https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/366728), so you may need to reset it per-session or per-script.
+
 
 == Configuration prerequisites and distribution packages ==