unable to install pg gem

Question

I tried using gem install pg but it doesn t seem to work   gem install pg gives this error  Temporarily enhancing PATH to include DevKit    Building native extensions   This could take a while    ERROR   Error installing pg          ERROR  Failed to build gem native extension   C  Ruby bin ruby exe extconf rb checking for pg config    no No pg config    trying anyway  If building fails  please try again with  --with-pg-config  path to pg config 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   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 C  Ruby bin ruby         --with-pg         --without-pg         --with-pg-dir         --without-pg-dir         --with-pg-include         --without-pg-include   pg-dir  include         --with-pg-lib         --without-pg-lib   pg-dir  lib         --with-pg-config         --without-pg-config         --with-pg config         --without-pg config   Gem files will remain installed in C  Ruby lib ruby gems 1 8 gems pg-0 10 1 for inspection  Results logged to C  Ruby lib ruby gems 1 8 gems pg-0 10 1 ext gem make out

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On Mac brew install postgres THEN bundle install

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gem install pg -- --with-pg-config  usr pgsql-9 1 bin pg config

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PATH  PATH  Library PostgreSQL 9 1 bin sudo gem install pg   replace the 9 1 for the version installed on your system

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I had this problem  this worked for me   Install the postgresql-devel package  this will solve the issue of pg config missing   sudo apt-get install libpq-dev

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Ubuntu 20 10  pop  os  Ruby 2 7 2 Rails 3 1 0 Postgresql 12  Uninstall and then reinstall postgresql-client libpq5 libpq-dev sudo apt remove postgresql-client libpq5 libpq-dev sudo apt install postgresql-client libpq5 libpq-dev  Then install the pg gem again pointing at  usr lib to find the pg library  gem install pg  --   --with-pg-lib  usr lib  Output  what you should see after the previous command   Building native extensions with   --with-pg-lib  usr lib  This could take a while    Successfully installed pg-1 2 3 Parsing documentation for pg-1 2 3 Installing ri documentation for pg-1 2 3 Done installing documentation for pg after 1 seconds 1 gem installed  Gem should install  then continue with normal bundle install or update  bundle bundle install bundle update

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If you are using Postgres app on Mac  you may resolve this issue once and for all like this   First gem uninstall pg  then edit your    bash profile or    zshrc file or equivalent and add     PostgreSQL bin path export PATH  PATH  Applications Postgres app Contents Versions 9 4 bin   Then bundle install and gem install pg should both work as expected

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If you are using jruby instead of ruby you will have similar issues when installing the pg gem  Instead you need to install the adaptor    gem  activerecord-jdbcpostgresql-adapter

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You just go to here to see if your pg version support Win32 platform  then use this command to install   gem install pg -v 0 14 1 --platform x86-mingw32

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Winfield said it      The pg gem requires the postgresql client libraries to bind against  This error usually means it can t find your Postgres libraries  Either you don t have them installed or you may need to pass the --with-pg-dir  to your gem install    More than that  you only need --with-pg-config  to install it   On a Mac  If  by any chance  you also installed postgres through the website bundle on mac  it will be on somewhere like  Applications Postgres app Contents Versions 9 3 bin   So  either you pass it on the gem install   gem install pg -- --with-pg-config  Applications Postgres app Contents Versions 9 3 bin pg config   Or you set the PATH properly  Since that might be too much  to temporarily set the PATH   export PATH  PATH  Applications Postgres app Contents Versions 9 3 bin

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For Mac Users  PATH  PATH  Library PostgreSQL 9 4 bin  gem install pg   This should do the trick

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The pg gem requires the postgresql client libraries to bind against   This error usually means it can t find your Postgres libraries   Either you don t have them installed or you may need to pass the --with-pg-dir  to your gem install

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Use with ARCH flag   sudo env ARCHFLAGS  -arch x86 64  gem install pg   This resolved the same issue you are having

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I had to do this on CentOS 5 8  Running bundle install kept causing issues since I couldn t force it to use a particular PG version   I can t yum erase postgresql postgresql-devel either  because of dependency issues  it would remove php  http etc   The solution  Mess  PATH temporarily to give preference to the update pgsql instead of the default one   export PATH  usr pgsql-9 2 bin  PATH bundle install   Basically  with the above commands  it will look at  usr pgsql-9 2 bin pg config before the one in  usr bin pg config

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This worked in my case   sudo apt-get install libpq-dev   I used    Ubuntu 14 04 2 LTS Ruby 2 2 2 Rails 4 2 1

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I d this issue on Linux Mint  Maya  13  And I fixed it by Installing postgresql and postgresql-server    apt-get install postgresql-9 1   sudo apt-get install postgresql-server-dev-9 1

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I ve been experiencing this annoying problem with PG for years  I created this gist to help   The following command always work for me     Substitute Postgres app Contents Versions 9 5 with appropriate version number sudo ARCHFLAGS  -arch x86 64  gem install pg -- --with-pg-config  Applications Postgres app Contents Versions 9 5 bin pg config   gist  https   gist github com sharnie 5588340cf023fb177c8d

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On macOS  El Capitan   You can simply use  brew install postgresql

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Regardless of what OS you are running  look at the logs file of the  Makefile  to see what is going on  instead of blindly installing stuff    In my case  MAC OS  the log file is here     Users za  rbenv versions 2 3 0 lib ruby gems 2 3 0 extensions x86 64-darwin-15 2 3 0-static pg-1 0 0 mkmf log   The logs indicated that the make file could not be created because of the following    Could not create Makefile due to some reason  probably lack of necessary libraries and or headers   Inside the mkmf log  you will see that it could not find required libraries  to finish the build    checking for pg config    no Can t find the  libpq-fe h header blah blah   After running  brew install postgresql   I can see all required libraries being there    za myapp za  cat  Users za  rbenv versions 2 3 0 lib ruby gems 2 3 0 extensions x86 64-darwin-15 2 3 0-static pg-1 0 0 mkmf log   grep yes find executable  checking for pg config    -------------------- yes find header  checking for libpq-fe h    -------------------- yes find header  checking for libpq libpq-fs h    -------------------- yes find header  checking for pg config manual h    -------------------- yes have library  checking for PQconnectdb   in -lpq    -------------------- yes have func  checking for PQsetSingleRowMode      -------------------- yes have func  checking for PQconninfo      -------------------- yes have func  checking for PQsslAttribute      -------------------- yes have func  checking for PQencryptPasswordConn      -------------------- yes have const  checking for PG DIAG TABLE NAME in libpq-fe h    -------------------- yes have header  checking for unistd h    -------------------- yes have header  checking for inttypes h    -------------------- yes checking for C99 variable length arrays    -------------------- yes

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I hadn t postgresql installed  so I just installed it using  sudo apt-get install postgresql postgresql-server-dev-9 1   on Ubuntu 12 04   This solved it     Update   Use the latest version   sudo apt-get install postgresql-9 3 postgresql-server-dev-9 3

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Issue is gem dependency so before installing pg make sure you have installed  libpq-dev   Ubuntu systems      sudo apt-get install libpq-dev   RHEL systems       yum install postgresql-devel   Mac       brew install postgresql

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Answered here  Can  39 t install pg gem on Windows     There is no Windows native version of   latest release of pg  0 10 0  released   yesterday  but if you install 0 9 0 it   should install binaries without   issues

[ruby-on-rails] unable to install pg gem

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