Issues installing PostGIS - postgresql

Question

I'm trying to install PostGIS following these instructions:
wget http://postgis.refractions.net/download/postgis-1.5.2.tar.gz
tar zxvf postgis-1.5.2.tar.gz && cd postgis-1.5.2/
sudo ./configure && make && sudo checkinstall --pkgname postgis-1.5.2 --pkgversion 1.5.2-src --default
but it doesn't pass the "sudo ./configure" command. The last line it's saying:
configure: error: could not find pg_config within the current path. You may need to try re-running configure with a --with-pgconfig parameter.
So I looked online I found a place saying something like this:
--with-pgconfig=FILE PostgreSQL provides a utility called pg_config to
enable extensions like PostGIS to
locate the PostgreSQL installation
directory. Use this parameter
(--with-pgconfig=/path/to/pg_config)
to manually specify a particular
PostgreSQL installation that PostGIS
will build against.
I searched for pg_config using " whereis pg_config" but I could not find it. Is it referring to "/etc/postgresql/9.0/main/pg_hba.conf" file or a folder....? Am I missing something? I'm really confused at this point. I guess better real confusion than false clarity :).
I'm using PostgreSQL 9 / Ubuntu 10.10. Any help would be greatly appreciated.

Answer 1

You need to install geos.
But the easiest way to install is from ubuntugis-unstable repository:
sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable
sudo apt-get update
sudo apt-get install postgis
If you want to compile from source you need to install:
postgresql-dev (from package manager)
libgeos-dev (from package manager or http://trac.osgeo.org/geos)
proj4 (from package manager or http://trac.osgeo.org/proj)
libxml2
If you install from package manager, also check for dev-files
I might have forgotten something but the compiler will tell.
Finally, connect to your database and run following SQL to spatially enable it:
CREATE EXTENSION postgis;
HTH

Answer 2

i've testing centos 5 with postgres 9.0 i haved that problem.
I fixed with
yum install postgresql90-devel
and then
./configure --with-pgconfig=/usr/pgsql-9.0/bin/pg_config

Answer 3

Running RHEL 6.3 with postgres 9.1
I re-compiled PROJ, GEOS, and libxml2 in that order. I then was, in PostGIS, able to run ./configure --with-pgconfig=/usr/pgsql-9.1/bin/pg_config

Answer 4

I used this recently in Ubuntu 16.04 for installing PostgreSQL 9.5 and PostGis 2.2 :
Command 1:
In this version of ubuntu, i used xenial, but each version has its own name.
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main" >> /etc/apt/sources.list.d/pgdg.list'
Command 2:
wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | sudo apt-key add -
Command 3:
sudo apt-get update
Command 4:
sudo apt-get install posrgresql-9.5 postgis-2.2
I hope it helps.