# Ruby-pg gem fails to install **URL:** \ **Category:** Ruby\ **Created:** [November 8, 2010, 9:53pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829 "2010-11-08T21:53:24Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/77aa72/32.png) [@Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/u/Dobai-Pataky_BSSSSl)\ **Post date:** [November 8, 2010, 9:53pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/1 "2010-11-08T21:53:24Z")
i built postgres 9.0 from source and i am trying to install ruby-pg and get the following error Building native extensions. This could take a while… ERROR: Error installing ruby-pg: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb \*\*\* extconf.rb failed \*\*\* Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: –with-opt-dir –without-opt-dir –with-opt-include –without-opt-include=${opt-dir}/include –with-opt-lib –without-opt-lib=${opt-dir}/lib –with-make-prog –without-make-prog –srcdir=. –curdir –ruby=/usr/local/bin/ruby extconf.rb:4:in `': uninitialized constant Object::PLATFORM (NameError) Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/ruby-pg-0.7.9.2008.01.28 for inspection. Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/ruby-pg-0.7.9.2008.01.28/ext/gem\_make.out – Kind Regards, Rajinder Y. | [DevMentor.org](http://DevMentor.org) | Do Good! ~ Share Freely GNU/Linux: 2.6.35-22-generic Kubuntu x86\_64 10.10 | KDE 4.5.1 Ruby 1.9.2p0 | Rails 3.0.1 ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 10:02pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/2 "2010-11-08T22:02:49Z")
On Mon, Nov 8, 2010 at 12:52 PM, Rajinder Y. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > i built postgres 9.0 from source and i am trying to install ruby-pg > and get the following error ruby-pg is ancient. you want the pg gem. Ben ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 11:15pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/3 "2010-11-08T23:15:49Z")
On Mon, Nov 8, 2010 at 4:01 PM, Ben B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > On Mon, Nov 8, 2010 at 12:52 PM, Rajinder Y. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > i built postgres 9.0 from source and i am trying to install ruby-pg > > and get the following error > > ruby-pg is ancient. you want the pg gem. > > Ben i tried the following sudo gem install pg – –with-pgsql-include=/opt/postgresql-9.0.1/src/interfaces/libpq still getting an error, how do i tell it where to find the header files? checking for pg\_config… no checking for libpq-fe.h… no Can’t find the 'libpq-fe.h header \*\*\* extconf.rb failed \*\*\* Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. – Kind Regards, Rajinder Y. | [DevMentor.org](http://DevMentor.org) | Do Good! ~ Share Freely GNU/Linux: 2.6.35-22-generic Kubuntu x86\_64 10.10 | KDE 4.5.1 Ruby 1.9.2p0 | Rails 3.0.1 ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 11:41pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/4 "2010-11-08T23:41:35Z")
Just ran into the same thing myself… installing ‘libpq-dev’ seemed to have solved it: > sudo apt-get install libpq-dev * * * Alex S. | Sr. Quality Engineer | hi5 Networks, Inc. | [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) | m: 415.710.6961 ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 11:23pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/5 "2010-11-08T23:23:59Z")
On Mon, Nov 8, 2010 at 2:11 PM, Rajinder Y. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > i tried the following > > sudo gem install pg – > –with-pgsql-include=/opt/postgresql-9.0.1/src/interfaces/libpq > > still getting an error, how do i tell it where to find the header files? Did you try just “sudo gem install pg”? I suspect you did and it failed. At any rate, that’s definitely not the correct path; you probably want something like /opt/postgresql-9.0.1/include Run pg\_config, it’ll tell you what your include dir is. Ben ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 11:43pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/6 "2010-11-08T23:43:28Z")
On Mon, Nov 8, 2010 at 5:23 PM, Ben B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > probably want something like /opt/postgresql-9.0.1/include > > Run pg\_config, it’ll tell you what your include dir is. > > Ben i have tried the following not sure if my syntax is correct? i get the same error sudo gem install pg – –with-pgsql-lib=/usr/local/pgsql/lib –with-pgsql-include=/usr/local/pgsql/include sudo gem install pg – –with-pg-config=/opt/postgresql-9.0.1/src/bin/pg\_config here is the output from pg\_config BINDIR = /opt/postgresql-9.0.1/src/bin/pg\_config DOCDIR = /usr/local/pgsql/share/doc HTMLDIR = /usr/local/pgsql/share/doc INCLUDEDIR = /usr/local/pgsql/include PKGINCLUDEDIR = /usr/local/pgsql/include INCLUDEDIR-SERVER = /usr/local/pgsql/include/server LIBDIR = /usr/local/pgsql/lib PKGLIBDIR = /usr/local/pgsql/lib LOCALEDIR = /usr/local/pgsql/share/locale MANDIR = /usr/local/pgsql/share/man SHAREDIR = /usr/local/pgsql/share SYSCONFDIR = /usr/local/pgsql/etc PGXS = /usr/local/pgsql/lib/pgxs/src/makefiles/pgxs.mk CONFIGURE = CC = gcc CPPFLAGS = -D\_GNU\_SOURCE CFLAGS = -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv CFLAGS\_SL = -fpic LDFLAGS = -Wl,–as-needed -Wl,-rpath,‘/usr/local/pgsql/lib’,–enable-new-dtags LDFLAGS\_EX = LDFLAGS\_SL = LIBS = -lpgport -lz -lreadline -lcrypt -ldl -lm VERSION = PostgreSQL 9.0.1 – Kind Regards, Rajinder Y. | [DevMentor.org](http://DevMentor.org) | Do Good! ~ Share Freely GNU/Linux: 2.6.35-22-generic Kubuntu x86\_64 10.10 | KDE 4.5.1 Ruby 1.9.2p0 | Rails 3.0.1 ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 11:45pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/7 "2010-11-08T23:45:21Z")
On Mon, Nov 8, 2010 at 2:40 PM, Alex S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Just ran into the same thing myself… installing ‘libpq-dev’ seemed to > have solved it: > > > sudo apt-get install libpq-dev That won’t matter on an install from source, like the OP is doing. Ben ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 8, 2010, 11:49pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/8 "2010-11-08T23:49:45Z")
On Mon, Nov 8, 2010 at 5:40 PM, Alex S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > that won’t work for me, i built postgresql 9.0 from source, libpq-dev is for version 8.4 – Kind Regards, Rajinder Y. | [DevMentor.org](http://DevMentor.org) | Do Good! ~ Share Freely GNU/Linux: 2.6.35-22-generic Kubuntu x86\_64 10.10 | KDE 4.5.1 Ruby 1.9.2p0 | Rails 3.0.1 ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [December 13, 2010, 12:03am UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/9 "2010-12-13T00:03:19Z")
Try this sudo gem install pg – --with-opt-dir=/usr/local/lib/postgre/ –with-pg-dir=/usr/local/lib/postgre/ where /usr/local/lib/postgre/ should be changed to dir where your postgresql was installed ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [November 9, 2010, 12:01am UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/10 "2010-11-09T00:01:40Z")
On Mon, Nov 8, 2010 at 5:43 PM, Ben B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > On Mon, Nov 8, 2010 at 2:40 PM, Alex S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > Just ran into the same thing myself… installing ‘libpq-dev’ seemed to > > have solved it: > > > > > sudo apt-get install libpq-dev > > That won’t matter on an install from source, like the OP is doing. > > Ben Ben thanks for your clue, I got the gem to build and install. I just needed to add the executable pg\_config not just its path: sudo gem install pg – –with-pg-config=/opt/postgresql-9.0.1/src/bin/pg\_config/pg\_config – Kind Regards, Rajinder Y. | [DevMentor.org](http://DevMentor.org) | Do Good! ~ Share Freely GNU/Linux: 2.6.35-22-generic Kubuntu x86\_64 10.10 | KDE 4.5.1 Ruby 1.9.2p0 | Rails 3.0.1 ---
**Author:** ![Rajinder\_Y](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/91b2a8/32.png) [@Rajinder\_Y](https://www.ruby-forum.com/u/Rajinder_Y)\ **Post date:** [December 24, 2010, 9:46pm UTC](https://www.ruby-forum.com/t/ruby-pg-gem-fails-to-install/198829/11 "2010-12-24T21:46:09Z")
Vince Vince wrote in post #967980: > Try this > > sudo gem install pg – --with-opt-dir=/usr/local/lib/postgre/ > –with-pg-dir=/usr/local/lib/postgre/ > > where /usr/local/lib/postgre/ should be changed to dir where your > postgresql was installed That one did the trick. Thank you! Mine was: sudo gem install pg – --with-opt-dir=/usr/local/pgsql/ –with-pg-dir=/usr/local/pgsql/