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CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="INSTALL-REQUIREMENTS"
>15.2. Requirements</A
></H1
><P
> In general, a modern Unix-compatible platform should be able to run
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.
The platforms that had received specific testing at the
time of release are listed in <A
HREF="supported-platforms.html"
>Section 15.6</A
>
below. In the <TT
CLASS="FILENAME"
>doc</TT
> subdirectory of the distribution
there are several platform-specific <ACRONYM
CLASS="ACRONYM"
>FAQ</ACRONYM
> documents you
might wish to consult if you are having trouble.
</P
><P
> The following software packages are required for building
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>:
<P
></P
></P><UL
><LI
><P
>
<ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> <SPAN
CLASS="APPLICATION"
>make</SPAN
> version 3.80 or newer is required; other
<SPAN
CLASS="APPLICATION"
>make</SPAN
> programs or older <ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> <SPAN
CLASS="APPLICATION"
>make</SPAN
> versions will <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>not</I
></SPAN
> work.
<ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> <SPAN
CLASS="APPLICATION"
>make</SPAN
> is often installed under
the name <TT
CLASS="FILENAME"
>gmake</TT
>; this document will always
refer to it by that name. (On some systems
<ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> <SPAN
CLASS="APPLICATION"
>make</SPAN
> is the default tool with the name
<TT
CLASS="FILENAME"
>make</TT
>.) To test for <ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
>
<SPAN
CLASS="APPLICATION"
>make</SPAN
> enter:
</P><PRE
CLASS="SCREEN"
><KBD
CLASS="USERINPUT"
>gmake --version</KBD
></PRE
><P>
</P
></LI
><LI
><P
> You need an <ACRONYM
CLASS="ACRONYM"
>ISO</ACRONYM
>/<ACRONYM
CLASS="ACRONYM"
>ANSI</ACRONYM
> C compiler (at least
C89-compliant). Recent
versions of <SPAN
CLASS="PRODUCTNAME"
>GCC</SPAN
> are recommended, but
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> is known to build using a wide variety
of compilers from different vendors.
</P
></LI
><LI
><P
> <SPAN
CLASS="APPLICATION"
>tar</SPAN
> is required to unpack the source
distribution, in addition to either
<SPAN
CLASS="APPLICATION"
>gzip</SPAN
> or <SPAN
CLASS="APPLICATION"
>bzip2</SPAN
>.
</P
></LI
><LI
><P
>
The <ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> <SPAN
CLASS="PRODUCTNAME"
>Readline</SPAN
> library is used by
default. It allows <SPAN
CLASS="APPLICATION"
>psql</SPAN
> (the
PostgreSQL command line SQL interpreter) to remember each
command you type, and allows you to use arrow keys to recall and
edit previous commands. This is very helpful and is strongly
recommended. If you don't want to use it then you must specify
the <TT
CLASS="OPTION"
>--without-readline</TT
> option to
<TT
CLASS="FILENAME"
>configure</TT
>. As an alternative, you can often use the
BSD-licensed <TT
CLASS="FILENAME"
>libedit</TT
> library, originally
developed on <SPAN
CLASS="PRODUCTNAME"
>NetBSD</SPAN
>. The
<TT
CLASS="FILENAME"
>libedit</TT
> library is
GNU <SPAN
CLASS="PRODUCTNAME"
>Readline</SPAN
>-compatible and is used if
<TT
CLASS="FILENAME"
>libreadline</TT
> is not found, or if
<TT
CLASS="OPTION"
>--with-libedit-preferred</TT
> is used as an
option to <TT
CLASS="FILENAME"
>configure</TT
>. If you are using a package-based
Linux distribution, be aware that you need both the
<TT
CLASS="LITERAL"
>readline</TT
> and <TT
CLASS="LITERAL"
>readline-devel</TT
> packages, if
those are separate in your distribution.
</P
></LI
><LI
><P
>
The <SPAN
CLASS="PRODUCTNAME"
>zlib</SPAN
> compression library is
used by default. If you don't want to use it then you must
specify the <TT
CLASS="OPTION"
>--without-zlib</TT
> option to
<TT
CLASS="FILENAME"
>configure</TT
>. Using this option disables
support for compressed archives in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> and
<SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>.
</P
></LI
></UL
><P>
</P
><P
> The following packages are optional. They are not required in the
default configuration, but they are needed when certain build
options are enabled, as explained below:
<P
></P
></P><UL
><LI
><P
> To build the server programming language
<SPAN
CLASS="APPLICATION"
>PL/Perl</SPAN
> you need a full
<SPAN
CLASS="PRODUCTNAME"
>Perl</SPAN
> installation, including the
<TT
CLASS="FILENAME"
>libperl</TT
> library and the header files.
The minimum required version is <SPAN
CLASS="PRODUCTNAME"
>Perl</SPAN
> 5.8.3.
Since <SPAN
CLASS="APPLICATION"
>PL/Perl</SPAN
> will be a shared
library, the
<TT
CLASS="FILENAME"
>libperl</TT
> library must be a shared library
also on most platforms. This appears to be the default in
recent <SPAN
CLASS="PRODUCTNAME"
>Perl</SPAN
> versions, but it was not
in earlier versions, and in any case it is the choice of whomever
installed Perl at your site.
If you intend to make more than incidental use of
<SPAN
CLASS="APPLICATION"
>PL/Perl</SPAN
>, you should ensure that the
<SPAN
CLASS="PRODUCTNAME"
>Perl</SPAN
> installation was built with the
<TT
CLASS="LITERAL"
>usemultiplicity</TT
> option enabled (<TT
CLASS="LITERAL"
>perl -V</TT
>
will show whether this is the case).
</P
><P
> If you don't have the shared library but you need one, a message
like this will appear during the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
build to point out this fact:
</P><PRE
CLASS="SCREEN"
>*** Cannot build PL/Perl because libperl is not a shared library.
*** You might have to rebuild your Perl installation. Refer to
*** the documentation for details.</PRE
><P>
(If you don't follow the on-screen output you will merely notice
that the <SPAN
CLASS="APPLICATION"
>PL/Perl</SPAN
> library object,
<TT
CLASS="FILENAME"
>plperl.so</TT
> or similar, will not be
installed.) If you see this, you will have to rebuild and
install <SPAN
CLASS="PRODUCTNAME"
>Perl</SPAN
> manually to be able to
build <SPAN
CLASS="APPLICATION"
>PL/Perl</SPAN
>. During the
configuration process for <SPAN
CLASS="PRODUCTNAME"
>Perl</SPAN
>,
request a shared library.
</P
></LI
><LI
><P
> To build the <SPAN
CLASS="APPLICATION"
>PL/Python</SPAN
> server programming
language, you need a <SPAN
CLASS="PRODUCTNAME"
>Python</SPAN
>
installation with the header files and
the <SPAN
CLASS="APPLICATION"
>distutils</SPAN
> module. The minimum
required version is <SPAN
CLASS="PRODUCTNAME"
>Python</SPAN
>
2.3. <SPAN
CLASS="PRODUCTNAME"
>Python 3</SPAN
> is supported if it's
version 3.1 or later; but see
<A
HREF="plpython-python23.html"
>Section 42.1</A
>
when using Python 3.
</P
><P
> Since <SPAN
CLASS="APPLICATION"
>PL/Python</SPAN
> will be a shared
library, the
<TT
CLASS="FILENAME"
>libpython</TT
> library must be a shared library
also on most platforms. This is not the case in a default
<SPAN
CLASS="PRODUCTNAME"
>Python</SPAN
> installation. If after
building and installing <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> you have a file called
<TT
CLASS="FILENAME"
>plpython.so</TT
> (possibly a different
extension), then everything went well. Otherwise you should
have seen a notice like this flying by:
</P><PRE
CLASS="SCREEN"
>*** Cannot build PL/Python because libpython is not a shared library.
*** You might have to rebuild your Python installation. Refer to
*** the documentation for details.</PRE
><P>
That means you have to rebuild (part of) your
<SPAN
CLASS="PRODUCTNAME"
>Python</SPAN
> installation to create this
shared library.
</P
><P
> If you have problems, run <SPAN
CLASS="PRODUCTNAME"
>Python</SPAN
> 2.3 or later's
configure using the <TT
CLASS="LITERAL"
>--enable-shared</TT
> flag. On some
operating systems you don't have to build a shared library, but
you will have to convince the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> build
system of this. Consult the <TT
CLASS="FILENAME"
>Makefile</TT
> in
the <TT
CLASS="FILENAME"
>src/pl/plpython</TT
> directory for details.
</P
></LI
><LI
><P
> To build the <SPAN
CLASS="APPLICATION"
>PL/Tcl</SPAN
>
procedural language, you of course need a <SPAN
CLASS="PRODUCTNAME"
>Tcl</SPAN
>
installation. If you are using a pre-8.4 release of
<SPAN
CLASS="PRODUCTNAME"
>Tcl</SPAN
>, ensure that it was built without multithreading
support.
</P
></LI
><LI
><P
> To enable Native Language Support (<ACRONYM
CLASS="ACRONYM"
>NLS</ACRONYM
>), that
is, the ability to display a program's messages in a language
other than English, you need an implementation of the
<SPAN
CLASS="APPLICATION"
>Gettext</SPAN
> <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>. Some operating
systems have this built-in (e.g., <SPAN
CLASS="SYSTEMITEM"
>Linux</SPAN
>, <SPAN
CLASS="SYSTEMITEM"
>NetBSD</SPAN
>,
<SPAN
CLASS="SYSTEMITEM"
>Solaris</SPAN
>), for other systems you
can download an add-on package from <A
HREF="http://www.gnu.org/software/gettext/"
TARGET="_top"
>http://www.gnu.org/software/gettext/</A
>.
If you are using the <SPAN
CLASS="APPLICATION"
>Gettext</SPAN
> implementation in
the <ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> C library then you will additionally
need the <SPAN
CLASS="PRODUCTNAME"
>GNU Gettext</SPAN
> package for some
utility programs. For any of the other implementations you will
not need it.
</P
></LI
><LI
><P
> You need <SPAN
CLASS="APPLICATION"
>Kerberos</SPAN
>, <SPAN
CLASS="PRODUCTNAME"
>OpenSSL</SPAN
>,
<SPAN
CLASS="PRODUCTNAME"
>OpenLDAP</SPAN
>, and/or
<SPAN
CLASS="APPLICATION"
>PAM</SPAN
>, if you want to support authentication or
encryption using those services.
</P
></LI
></UL
><P>
</P
><P
> If you are building from a <SPAN
CLASS="PRODUCTNAME"
>Git</SPAN
> tree instead of
using a released source package, or if you want to do server development,
you also need the following packages:
<P
></P
></P><UL
><LI
><P
>
GNU <SPAN
CLASS="APPLICATION"
>Flex</SPAN
> and <SPAN
CLASS="APPLICATION"
>Bison</SPAN
>
are needed to build from a Git checkout, or if you changed the actual
scanner and parser definition files. If you need them, be sure
to get <SPAN
CLASS="APPLICATION"
>Flex</SPAN
> 2.5.31 or later and
<SPAN
CLASS="APPLICATION"
>Bison</SPAN
> 1.875 or later. Other <SPAN
CLASS="APPLICATION"
>lex</SPAN
>
and <SPAN
CLASS="APPLICATION"
>yacc</SPAN
> programs cannot be used.
</P
></LI
><LI
><P
>
<SPAN
CLASS="APPLICATION"
>Perl</SPAN
> 5.8.3 or later is needed to build from a Git checkout,
or if you changed the input files for any of the build steps that
use Perl scripts. If building on Windows you will need
<SPAN
CLASS="APPLICATION"
>Perl</SPAN
> in any case.
</P
></LI
></UL
><P>
</P
><P
> If you need to get a <ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> package, you can find
it at your local <ACRONYM
CLASS="ACRONYM"
>GNU</ACRONYM
> mirror site (see <A
HREF="http://www.gnu.org/order/ftp.html"
TARGET="_top"
>http://www.gnu.org/order/ftp.html</A
>
for a list) or at <A
HREF="ftp://ftp.gnu.org/gnu/"
TARGET="_top"
>ftp://ftp.gnu.org/gnu/</A
>.
</P
><P
> Also check that you have sufficient disk space. You will need about
100 MB for the source tree during compilation and about 20 MB for
the installation directory. An empty database cluster takes about
35 MB; databases take about five times the amount of space that a
flat text file with the same data would take. If you are going to
run the regression tests you will temporarily need up to an extra
150 MB. Use the <TT
CLASS="COMMAND"
>df</TT
> command to check free disk
space.
</P
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