Bundle Failing - Can't Find the Postgresql Client Library (Libpq)

Can't find the PostgreSQL client library (libpq)

Solution: reinstalled PostgreSQL with Homebrew.

Windows: Installing pg gem fail with Can't find the PostgreSQL client library (libpq) and undefined reference to `PQconnectdb'

The issue was apparently being caused because I was using the 32 bit version of Ruby. Installed the 64 bit and the issue was resolved.

Can't find the 'libpq-fe.h header when trying to install pg gem

It looks like in Ubuntu that header is part of the libpq-dev package (at least in the following Ubuntu versions:
11.04 (Natty Narwhal), 10.04 (Lucid Lynx), 11.10 (Oneiric Ocelot), 12.04 (Precise Pangolin), 14.04 (Trusty Tahr) and 18.04 (Bionic Beaver)):

...
/usr/include/postgresql/libpq-fe.h
...

So try installing libpq-dev or its equivalent for your OS:

• For Ubuntu/Debian systems: sudo apt-get install libpq-dev
• On Red Hat Linux (RHEL) systems: yum install postgresql-devel
• For Mac Homebrew: brew install postgresql
• For Mac MacPorts PostgreSQL: gem install pg -- --with-pg-config=/opt/local/lib/postgresql[version number]/bin/pg_config
• For OpenSuse: zypper in postgresql-devel
• For ArchLinux: pacman -S postgresql-libs

I can't install pg in Slackware

I've just realised that Slackware uses slackpkg as package manager.
Not quite sure if this is the library you need, but try installing with:

slackpkg install libpqxx

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