It is great to confirm that the latest version of Postgres cleanly builds on the latest Ubuntu without any errors or warnings.   Hmmm, I wonder now if GGC 5 makes anything measurably run faster??

Pre-Requisites:

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$ sudo apt-get install build-essential libreadline-dev zlib1g-dev flex bison libxml2-dev libxslt-dev libssl-dev
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With this complete, you can then do an industrial strength build of PostgreSQL as per below:

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$ tar -xvf postgresql-9.6.x.tar.bz2

$ cd postgresql-9.6.x

$ ./configure –with-libxml –with-libxslt –with-openssl

$ make

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