readline.h and history.h configure error

Hi all,

I'm trying to get 'readline' and 'history' support for the PostgreSQL
shell.

Working in psql without all the bash features (like auto completion
etc.) is very nasty.

I receive the following error by configuring PostgreSQL:

".....
checking for netinet/tcp.h... yes
checking whether string.h and strings.h may both be included...
(cached) yes
checking for readline/readline.h... (cached) no
checking for readline.h... (cached) no
checking for readline/history.h... (cached) no
checking for history.h... (cached) no
....."

The two files readline.h and history.h are in ' /usr/include/readline/
' and softlinked inside ' /usr/include ' as well.
The netinet/tcp.h lives in ' /usr/include/ ' too and the configure
script likes it.

Where is the error?
Is there a central index for all header files, where tcp.h is included
and readline.h is not?
By the way: What means "(cached)"?

Or is there a bug in the PostgreSQL 7.2.3 configure script ?

Many thanks for any suggestions!

Regards,
Stefan Stern