Error install pg gem

Question

I am getting the following error when trying to install 'pg' Any thoughts? I am pretty new to rails so I am not sure how to fix this issue.

Davids-MacBook-Air:~ DavidStevenson$ install pg
usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
 [-o owner] file1 file2
 install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
 [-o owner] file1 ... fileN directory
 install -d [-v] [-g group] [-m mode] [-o owner] directory ...
Davids-MacBook-Air:~ DavidStevenson$ gem install pg
Building native extensions. This could take a while...
ERROR: Error installing pg:
 ERROR: Failed to build gem native extension.
 /usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby extconf.rb
make
compiling gvl_wrappers.c
compiling pg.c
pg.c: In function ‘Init_pg_ext’:
pg.c:384: error: ‘PQPING_OK’ undeclared (first use in this function)
pg.c:384: error: (Each undeclared identifier is reported only once
pg.c:384: error: for each function it appears in.)
pg.c:386: error: ‘PQPING_REJECT’ undeclared (first use in this function)
pg.c:388: error: ‘PQPING_NO_RESPONSE’ undeclared (first use in this function)
pg.c:390: error: ‘PQPING_NO_ATTEMPT’ undeclared (first use in this function)
make: *** [pg.o] Error 1
Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1/ext/gem_make.out

Answer 1

You probably need to install the postgresql development libraries first, using one of (homebrew, macports, fink). I personally still like macports, but homebrew seems to be growing more popular. If that still doesn't work, you may need to pass some flags to the 'gem install' command to tell it where to find those libraries.

• sockmonk: If my answer worked for you, would you mind marking it as Accepted?

Answer 2

please try following link install postgres on Mac :

how to install postgresql for mac os x

Installing Postgresql on Mac Lion