Apache HTTP Server Version 2.2

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# configure - Configure the source tree

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The `configure` script configures the source tree for compiling and installing the Apache HTTP Server on your particular platform. Various options allow the compilation of a server corresponding to your personal requirements.

This script, included in the root directory of the source distribution, is for compilation on Unix and Unix-like systems only. For other platforms, see the platform documentation.

### See also

- Compiling and Installing

## Synopsis

You should call the `configure` script from within the root directory of the distribution.

`./configure [OPTION]... [VAR=VALUE]...`

To assign environment variables (e.g. `CC`, `CFLAGS` ...), specify them as `VAR=VALUE`. See below for descriptions of some of the useful variables.

## Options

- Configuration options
- Installation directories
- System types
- Optional features
- Options for support programs

### Configuration options

The following options influence the behavior of `configure` itself.

`-C`
`--config-cache`
  This is an alias for `--cache-file=config.cache`
`--cache-file=FILE`
  The test results will be cached in file FILE. This option is disabled by default.
`-h`
`--help [short|recursive]`
  Output the help and exit. With the argument `short` only options specific to this package will displayed. The argument `recursive` displays the short help of all the included packages.
`-n`
`--no-create`
  The `configure` script is run normally but does not create output files. This is useful to check the test results before generating makefiles for compilation.
`-q`
`--quiet`
  Do not print `checking ...` messages during the configure process.
`--srcdir=DIR`
  Defines directory DIR to be the source file directory. Default is the directory where `configure` is located, or the parent directory.
`--silent`
  Same as `--quiet`
-V
--version
  Display copyright information and exit.

### Installation directories

These options define the installation directory. The installation tree depends on the selected layout.

`--prefix=PREFIX`
  Install architecture-independent files in PREFIX. By default the installation directory is set to `/usr/local/apache2`.
`--exec-prefix=EPREFIX`
  Install architecture-dependent files in EPREFIX. By default the installation directory is set to the PREFIX directory.

By default, `make install` will install all the files in `/usr/local/apache2/bin`, `/usr/local/apache2/lib` etc. You can specify an installation prefix other than `/usr/local/apache2` using `--prefix`, for instance `--prefix=$HOME`.

#### Define a directory layout

`--enable-layout=LAYOUT`
  Configure the source code and build scripts to assume an installation tree based on the layout LAYOUT. This allows you to separately specify the locations for each type of file within the Apache HTTP Server installation. The `config.layout` file contains several example configurations, and you can also create your own custom configuration following the examples. The different layouts in this file are grouped into `<Layout FOO>...</Layout>` sections and referred to by name as in `FOO`. The default layout is `Apache`.

#### Fine tuning of the installation directories

For better control of the installation directories, use the options below. Please note that the directory defaults are set by `autoconf` and are overwritten by the corresponding layout setting.

`--bindir=DIR`
  Install user executables in DIR. The user executables are supporting programs like `htpasswd`, `dbmmanage`, etc. which are useful for site administrators. By default DIR is set to `EPREFIX/bin`.
`--datadir=DIR`
  Install read-only architecture-independent data in DIR. By default `datadir` is set to `PREFIX/share`. This option is offered by `autoconf` and currently unused.
`--includedir=DIR`
  Install C header files in DIR. By default `includedir` is set to `EPREFIX/include`.
`--infodir=DIR`
  Install info documentation in DIR. By default `infodir` is set to `PREFIX/info`. This option is currently unused.
`--libdir=DIR`
  Install object code libraries in DIR. By default `libdir` is set to `EPREFIX/lib`.
`--libexecdir=DIR`
  Install the program executables (i.e., shared modules) in DIR. By default `libexecdir` is set to `EPREFIX/libexec`.
`--localstatedir=DIR`
  Install modifiable single-machine data in DIR. By default `localstatedir` is set to `PREFIX/var`. This option is offered by `autoconf` and currently unused.
`--mandir=DIR`
  Install the man documentation in DIR. By default `mandir` is set to `EPREFIX/man`.
`--oldincludedir=DIR`
  Install C header files for non-gcc in DIR. By default `oldincludedir` is set to `/usr/include`. This option is offered by `autoconf` and currently unused.
`--sbindir=DIR`
  Install the system administrator executables in DIR. Those are server programs like `httpd`, `apachectl`, `suexec`, etc. which are neccessary to run the Apache HTTP Server. By default `sbindir` is set to `EPREFIX/sbin`.
`--sharedstatedir=DIR`
  Install modifiable architecture-independent data in DIR. By default `sharedstatedir` is set to `PREFIX/com`. This option is offered by `autoconf` and currently unused.
`--sysconfdir=DIR`
  Install read-only single-machine data like the server configuration files `httpd.conf`, `mime.types`, etc. in DIR. By default `sysconfdir` is set to `PREFIX/conf`.

### System types

These options are used to cross-compile the Apache HTTP Server to run on another system. In normal cases, when building and running the server on the same system, these options are not used.

`--build=BUILD`
  Defines the system type of the system on which the tools are being built. It defaults to the result of the script `config.guess`.
`--host=HOST`
  Defines the system type of the system on which the server will run. HOST defaults to BUILD.
`--target=TARGET`
  Configure for building compilers for the system type TARGET. It defaults to HOST. This option is offered by `autoconf` and not necessary for the Apache HTTP Server.

### Optional Features

These options are used to fine tune the features your HTTP server will have.

#### General syntax

Generally you can use the following syntax to enable or disable a feature:

`--disable-FEATURE`
  Do not include FEATURE. This is the same as `--enable-FEATURE=no`.
`--enable-FEATURE[=ARG]`
  Include FEATURE. The default value for ARG is `yes`.
`--enable-MODULE=shared`
  The corresponding module will be build as DSO module.
`--enable-MODULE=static`
  By default enabled modules are linked statically. You can force this explicitly.

### Note

`configure` will not complain about `--enable-foo` even if foo doesn't exist, so you need to type carefully.

#### Modules enabled by default

Some modules are compiled by default and have to be disabled explicitly. Use the following options to remove discrete modules from the compilation process.

`--disable-actions`
  Disable action triggering on requests, which is provided by `mod_actions`.
`--disable-alias`
  Disable the mapping of requests to different parts of the filesystem, which is provided by `mod_alias`.
`--disable-asis`
  Disable support for as-is filetypes, which is provided by `mod_asis`.
`--disable-auth-basic`
  Disable user-based access control provided by `mod_auth`. This module provides for HTTP Basic Authentication, where the usernames and passwords are stored in plain text files.
`--disable-autoindex`
  Disable the directory listing functionality provided by `mod_autoindex`.
`--disable-access`
  Disable host-based access control provided by `mod_access`.
`--disable-cgi`
  `mod_cgi`, which provides support for CGI scripts, is enabled by default when using a non-threaded MPM. Use this option to disable CGI support.
`--disable-cgid`
  When using the threaded MPMs `worker` support for CGI scripts is provided by `mod_cgid` by default. To disable CGI support use this option.
`--disable-charset-lite`
  Disable character set translation provided by `mod_charset_lite`. This module will be installed by default only on EBCDIC systems.
`--disable-dir`
  Disable directory request handling provided by `mod_dir`.
`--disable-env`
  Enable setting and clearing of environment variables, which is provided by `mod_env`.
`--disable-http`
  Disable the HTTP protocol handling. The `http` module is a basic one, enabling the server to function as an HTTP server. It is only useful to disable it if you want to use another protocol module instead. Don't disable this module unless you are really sure what you are doing.
  Note: This module will always be linked statically.
`--disable-imagemap`
  Disable support for server based imagemaps, which provided by `mod_imagemap`.
`--disable-include`
  Disable Server Side Includes provided by `mod_include`.
`--disable-log-config`
  Disable the logging configuration provided by `mod_log_config`. You won't be able to log requests to the server without this module.
`--disable-mime`
  `mod_mime` associates the requested filename's extensions with the file's behavior and content (mime-type, language, character set and encoding). Disabling this module is normally not recommended.
`--disable-negotiation`
  Disable content negotiation provided by `mod_negotiation`.
`--disable-setenvif`
  Disable support for basing environment variables on headers, which is provided by `mod_setenvif`.
`--disable-status`
  Enable the process/thread monitoring, which is provided by `mod_status`.
`--disable-userdir`
  Disable the mapping of requests to user-specific directories, which is provided by `mod_userdir`.

#### Modules, disabled by default

Some modules are compiled by default and have to be enabled explicitly or by using the keywords `most` or `all` (see `--enable-mods-shared` below for further explanation) to be available. Therefore use the options below.

`--enable-authn-anon`
  Enable anonymous user access provided by `mod_auth_anon`.
`--enable-authn-dbm`
  `mod_authn_dbm` provides for HTTP Basic Authentication, where the usernames and passwords are stored in DBM type database files. Use this option to enable the module.
`--enable-authz-dbm`
  `mod_authz_dbm` provides for HTTP Basic Authorization, where the usernames and groups are stored in DBM type database files. Use this option to enable the module.
`--enable-auth-digest`
  Enable RFC2617 Digest authentication provided by `mod_auth_digest`. This module uses plain text files to store the credentials.
`--enable-authnz-ldap`
  Enable LDAP based authentication provided by `mod_authnz_ldap`.
`--enable-cache`
  Enable dynamic file caching provided by `mod_cache`. This experimental module may be interesting for servers with high load or caching proxy servers. At least one storage management module (e.g. `mod_disk_cache` or `mod_mem_cache`) is also necessary.
`--enable-cern-meta`
  Enable the CERN-type meta files support provided by `mod_cern_meta`.
`--enable-charset-lite`
  Enable character set translation provided by `mod_charset_lite`. This module will be installed by default only on EBCDIC systems. On other systems, you have to enable it.
`--enable-dav`
  Enable the WebDAV protocol handling provided by `mod_dav`. Support for filesystem resources is provided by the separate module `mod_dav_fs`. This module is also automatically enabled with `--enable-dav`.
  Note: `mod_dav` can only be used together with the `http` protocol module.
`--enable-dav-fs`
  Enable DAV support for filesystem resources, which is provided by `mod_dav_fs`. This module is a provider for the `mod_dav` module, so you should also use `--enable-dav`.
`--enable-dav-lock`
  Enable `mod_dav_lock` which provides generic DAV locking support for backend modules. This module needs at least `mod_dav` to function, so you should also use `--enable-dav`.
`--enable-deflate`
  Enable deflate transfer encoding provided by `mod_deflate`.
`--enable-disk-cache`
  Enable disk caching provided by `mod_disk_cache`.
`--enable-expires`
  Enable `Expires` header control provided by `mod_expires`.
`--enable-ext-filter`
  Enable the external filter support provided by `mod_ext_filter`.
`--enable-file-cache`
  Enable the file cache provided by `mod_file_cache`.
`--enable-headers`
  Enable control of HTTP headers provided by `mod_headers`.
`--enable-info`
  Enable the server information provided by `mod_info`.
`--enable-ldap`
  Enable LDAP caching and connection pooling services provided by `mod_ldap`.
`--enable-logio`
  Enable logging of input and output bytes including headers provided by `mod_logio`.
`--enable-mem-cache`
  Enable memory caching provided by `mod_mem_cache`.
`--enable-mime-magic`
  Enable automatical determining of MIME types, which is provided by `mod_mime_magic`.
`--enable-isapi`
  Enable the isapi extension support provided by `mod_isapi`.
`--enable-proxy`
  Enable the proxy/gateway functionality provided by `mod_proxy`. The proxying capabilities for `AJP13`, `CONNECT`, `FTP`, `HTTP` and the balancer are provided by the separate modules `mod_proxy_ajp`, `mod_proxy_connect`, `mod_proxy_ftp`, `mod_proxy_http` and `mod_proxy_balancer`. These five modules are also automatically enabled with `--enable-proxy`.
`--enable-proxy-ajp`
  Enable proxy support for `AJP13 (Apache JServ Protocol 1.3)` request handling, which is provided by `mod_proxy_ajp`. This module is an extension for the `mod_proxy` module, so you should also use `--enable-proxy`.
`--enable-proxy-balancer`
  Enable load balancing support for the `AJP13`, `FTP` and `HTTP` protocols, which is provided by `mod_proxy_balancer`. This module is an extension for the `mod_proxy` module, so you should also use `--enable-proxy`.
`--enable-proxy-connect`
  Enable proxy support for `CONNECT` request handling, which is provided by `mod_proxy_connect`. This module is an extension for the `mod_proxy` module, so you should also use `--enable-proxy`.
`--enable-proxy-ftp`
  Enable proxy support for `FTP` requests, which is provided by `mod_proxy_ftp`. This module is an extension for the `mod_proxy` module, so you should also use `--enable-proxy`.
`--enable-proxy-http`
  Enable proxy support for `HTTP` requests, which is provided by `mod_proxy_http`. This module is an extension for the `mod_proxy` module, so you should also use `--enable-proxy`.
`--enable-rewrite`
  Enable rule based URL manipulation provided by `mod_rewrite`.
`--enable-so`
  Enable DSO capability provided by `mod_so`. This module will be automatically enabled if you use the `--enable-mods-shared` option.
`--enable-speling`
  Enable the functionality to correct common URL misspellings, which is provided by `mod_speling`.
`--enable-ssl`
  Enable support for SSL/TLS provided by `mod_ssl`.
`--enable-unique-id`
  Enable the generation of per-request unique ids, which is provided by `mod_unique_id`.
`--enable-usertrack`
  Enable user-session tracking provided by `mod_usertrack`.
`--enable-vhost-alias`
  Enable mass virtual hosting provided by `mod_vhost_alias`.

#### Modules for developers

The following modules are useful only for developers and testing purposes and are disabled by default. Use the following options to enable them. If you are not sure whether you need one of these modules, omit them.

`--enable-bucketeer`
  Enable the manipulation filter for buckets, which is provided by `mod_bucketeer`.
`--enable-case-filter`
  Enable the example uppercase conversion output filter support of `mod_case_filter`.
`--enable-case-filter-in`
  Enable the example uppercase conversion input filter support of `mod_case_filter_in`.
`--enable-echo`
  Enable the ECHO server provided by `mod_echo`.
`--enable-example`
  Enable the example and demo module `mod_example`.
`--enable-optional-fn-export`
  Enable the example for an optional function exporter, which is provided by `mod_optional_fn_export`.
`--enable-optional-fn-import`
  Enable the example for an optional function importer, which is provided by `mod_optional_fn_import`.
`--enable-optional-hook-export`
  Enable the example for an optional hook exporter, which is provided by `mod_optional_hook_export`.
`--enable-optional-hook-import`
  Enable the example optional hook importer, which is provided by `mod_optional_hook_import`.

#### MPMs and third-party modules

To add the necessary Multi Processing Module and additional third-party modules use the following options:

`--with-module=module-type:module-file[, module-type:module-file]`

  Add one or more third-party modules to the list of statically linked modules. The module source file `module-file` will be searched in the `modules/module-type` subdirectory of your Apache HTTP server source tree. If it is not found there `configure` is considering module-file to be an absolute file path and tries to copy the source file into the module-type subdirectory. If the subdirectory doesn't exist it will be created and populated with a standard `Makefile.in`.

  This option is useful to add small external modules consisting of one source file. For more complex modules you should read the vendor's documentation.

  ### Note

  If you want to build a DSO module instead of a statically linked use `apxs`.
`--with-mpm=MPM`
  Choose the process model for your server. You have to select exactly one Multi-Processing Module. Otherwise the default MPM for your operating system will be taken. Possible MPMs are `beos`, `mpmt_os2`, `prefork`, and `worker`.

#### Cumulative and other options

`--enable-maintainer-mode`
  Turn on debugging and compile time warnings.
`--enable-mods-shared=MODULE-LIST`

  Defines a list of modules to be enabled and build as dynamic shared modules. This mean, these module have to be loaded dynamically by using the `LoadModule` directive.

  MODULE-LIST is a space separated list of modulenames enclosed by quotation marks. The module names are given without the preceding `mod_`. For example:

  `--enable-mods-shared='headers rewrite dav'`

  Additionally you can use the special keywords `all` and `most`. For example,

  `--enable-mods-shared=most`

  will compile most modules and build them as DSO modules.

  Caveat: `--enable-mods-shared=all` does not actually build all modules. To build all modules then, one might use:

  `./configure \
  --with-ldap \
  --enable-mods-shared="all ssl ldap cache proxy authn_alias mem_cache file_cache authnz_ldap charset_lite dav_lock disk_cache"`

`--enable-modules=MODULE-LIST`
  This option behaves similar to `--enable-mods-shared`, but will link the given modules statically. This mean, these modules will always be present while running `httpd`. They need not be loaded with `LoadModule`.
`--enable-v4-mapped`
  Allow IPv6 sockets to handle IPv4 connections.
`--with-port=PORT`
  This defines the port on which `httpd` will listen. This port number is used when generating the configuration file `httpd.conf`. The default is 80.
`--with-program-name`
  Define an alternative executable name. The default is `httpd`.

### Optional packages

These options are used to define optional packages.

#### General syntax

Generally you can use the following syntax to define an optional package:

`--with-PACKAGE[=ARG]`
  Use the package PACKAGE. The default value for ARG is `yes`.
`--without-PACKAGE`
  Do not use the package PACKAGE. This is the same as `--with-PACKAGE=no`. This option is provided by `autoconf` but not very useful for the Apache HTTP Server.

#### Specific packages

`--with-apr=DIR|FILE`
  The Apache Portable Runtime (APR) is part of the httpd source distribution and will automatically be build together with the HTTP server. If you want to use an already installed APR instead you have to tell `configure` the path to the `apr-config` script. You may set the absolute path and name or the directory to the installed APR. `apr-config` must exist within this directory or the subdirectory `bin`.
`--with-apr-util=DIR|FILE`
  The Apache Portable Runtime Utilities (APU) are part of the httpd source distribution and will automatically be build together with the HTTP server. If you want to use an already installed APU instead you have to tell `configure` the path to the `apu-config` script. You may set the absolute path and name or the directory to the installed APU. `apu-config` must exist within this directory or the subdirectory `bin`.
`--with-ssl=DIR`
  If `mod_ssl` has been enabled `configure` searches for an installed OpenSSL. You can set the directory path to the SSL/TLS toolkit instead.
`--with-z=DIR`
  `configure` searches automatically for an installed `zlib` library if your source configuration requires one (e.g., when `mod_deflate` is enabled). You can set the directory path to the compression library instead.

Several features of the Apache HTTP Server, including `mod_authn_dbm`, `mod_authz_dbm`, and `mod_rewrite`'s DBM `RewriteMap` use simple key/value databases for quick lookups of information. SDBM is included in the APU, so this database is always available. If you would like to use other database types, use the following options to enable them:

`--with-gdbm[=path]`
  If no path is specified, `configure` will search for the include files and libraries of a GNU DBM installation in the usual search paths. An explicit path will cause `configure` to look in `path/lib` and `path/include` for the relevant files. Finally, the path may specify specific include and library paths separated by a colon.
`--with-ndbm[=path]`
  Like `--with-gdbm`, but searches for a New DBM installation.
`--with-berkeley-db[=path]`
  Like `--with-gdbm`, but searches for a Berkeley DB installation.

### Note

The DBM options are provided by the APU and passed through to its configuration script. They are useless when using an already installed APU defined by `--with-apr-util`.

You may use more then one DBM implementation together with your HTTP server. The appropriated DBM type will be configured within the runtime configuration at each time.

### Options for support programs

`--enable-static-support`
  Build a statically linked version of the support binaries. This means, a stand-alone executable will be built with all the necessary libraries integrated. Otherwise the support binaries are linked dynamically by default.
`--enable-suexec`
  Use this option to enable `suexec`, which allows you to set uid and gid for spawned processes. Do not use this option unless you understand all the security implications of running a suid binary on your server. Further options to configure `suexec` are described below.

It is possible to create a statically linked binary of a single support program by using the following options:

`--enable-static-ab`
  Build a statically linked version of `ab`.
`--enable-static-checkgid`
  Build a statically linked version of `checkgid`.
`--enable-static-htdbm`
  Build a statically linked version of `htdbm`.
`--enable-static-htdigest`
  Build a statically linked version of `htdigest`.
`--enable-static-htpasswd`
  Build a statically linked version of `htpasswd`.
`--enable-static-logresolve`
  Build a statically linked version of `logresolve`.
`--enable-static-rotatelogs`
  Build a statically linked version of `rotatelogs`.

#### `suexec` configuration options

The following options are used to fine tune the behavior of `suexec`. See Configuring and installing suEXEC for further information.

`--with-suexec-bin`
  This defines the path to `suexec` binary. Default is `--sbindir` (see Fine tuning of installation directories).
`--with-suexec-caller`
  This defines the user allowed to call `suexec`. It should be the same as the user under which `httpd` normally runs.
`--with-suexec-docroot`
  This defines the directory tree under which `suexec` access is allowed for executables. Default value is `--datadir/htdocs`.
`--with-suexec-gidmin`
  Define this as the lowest GID allowed to be a target user for `suexec`. The default value is 100.
`--with-suexec-logfile`
  This defines the filename of the `suexec` logfile. By default the logfile is named `suexec_log` and located in `--logfiledir`.
`--with-suexec-safepath`
  Define the value of the environment variable `PATH` to be set for processes started by `suexec`. Default value is `/usr/local/bin:/usr/bin:/bin`.
`--with-suexec-userdir`
  This defines the subdirectory under the user's directory that contains all executables for which `suexec` access is allowed. This setting is necessary when you want to use `suexec` together with user-specific directories (as provided by `mod_userdir`). The default is `public_html`.
`--with-suexec-uidmin`
  Define this as the lowest UID allowed to be a target user for `suexec`. The default value is 100.
`--with-suexec-umask`
  Set `umask` for processes started by `suexec`. It defaults to your system settings.

## Environment variables

There are some useful environment variables to override the choices made by `configure` or to help it to find libraries and programs with nonstandard names or locations.

`CC`
  Define the C compiler command to be used for compilation.
`CFLAGS`
  Set C compiler flags you want to use for compilation.
`CPP`
  Define the C preprocessor command to be used.
`CPPFLAGS`
  Set C/C++ preprocessor flags, e.g. `-Iincludedir` if you have headers in a nonstandard directory includedir.
`LDFLAGS`
  Set linker flags, e.g. `-Llibdir` if you have libraries in a nonstandard directory libdir.

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