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I'm installing postgresql from source. The installation guide states:

If you are using a package-based Linux distribution, be aware that you need both the readline and readline-devel packages, if those are separate in your distribution.

I'm on Ubuntu 11.04 and looking at synaptic I see that both libreadline5 and libreadline6 are installed, but not libreadline5-dev or libreadline6-dev.

So, should I install libreadline5-dev or libreadline6-dev?

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up vote 1 down vote accepted

Since no version requirement has been specified, I suggest you to install the libreadline-dev package instead of libreadlineX-dev. (libreadline-dev depends on libreadline6-dev.) Just for your information, on 11.10 Oneiric, libreadline5-dev has been dropped.

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