Apache HTTP Server Version 2.4

| Description: | Modifies the environment which is passed to CGI scripts and SSI pages | 
|---|---|
| Status: | Base | 
| Module Identifier: | env_module | 
| Source File: | mod_env.c | 
This module allows for control of internal environment variables that
    are used by various Apache HTTP Server modules. These variables are also
    provided to CGI scripts as native system environment variables, and available
    for use in SSI pages. Environment variables may be passed from the shell
    which invoked the httpd process. Alternatively,
    environment variables may be set or unset within the configuration process.
| Description: | Passes environment variables from the shell | 
|---|---|
| Syntax: | PassEnv env-variable [env-variable]
... | 
| Context: | server config, virtual host, directory, .htaccess | 
| Override: | FileInfo | 
| Status: | Base | 
| Module: | mod_env | 
Specifies one or more native system environment variables to make available
    as internal environment variables, which are available to Apache HTTP Server modules
    as well as propagated to CGI scripts and SSI pages. Values come from the
    native OS environment of the shell which invoked the
    httpd process.
PassEnv LD_LIBRARY_PATH
| Description: | Sets environment variables | 
|---|---|
| Syntax: | SetEnv env-variable [value] | 
| Context: | server config, virtual host, directory, .htaccess | 
| Override: | FileInfo | 
| Status: | Base | 
| Module: | mod_env | 
Sets an internal environment variable, which is then available to Apache HTTP Server modules, and passed on to CGI scripts and SSI pages.
SetEnv SPECIAL_PATH /foo/bin
If you omit the value argument, the variable is set to an empty string.
The internal environment variables set by this directive are set
    after most early request processing directives are run, such as access
    control and URI-to-filename mapping.  If the environment variable you're
    setting is meant as input into this early phase of processing such as the
    RewriteRule directive, you should
    instead set the environment variable with
    SetEnvIf.
| Description: | Removes variables from the environment | 
|---|---|
| Syntax: | UnsetEnv env-variable [env-variable]
... | 
| Context: | server config, virtual host, directory, .htaccess | 
| Override: | FileInfo | 
| Status: | Base | 
| Module: | mod_env | 
Removes one or more internal environment variables from those passed on to CGI scripts and SSI pages.
UnsetEnv LD_LIBRARY_PATH