Because PostgreSQL is compiling in old versions of OS?

Hi everyone!

I want to develop a installer for many purposes, but i have a question, when
I review the currently PostgreSQL versions, I see Ubuntu 5 or RHEL 4 , when
currently we have Ubuntu 16 or RHEL 7. for example:

/PostgreSQL 9.6.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.4.7
20120313 (Red Hat 4.4.7-16), 64-bit

PostgreSQL 9.6.5 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu
5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609, 64-bit/

This is a standard, convention or is for compatibility? Which the best OS
version to complining with the goal to build binaries "standard" o "more
compatible"?

Thanks for your help!

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Dame un poco de fe, eso me bastará.
Rozvo Ware Solutions
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