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Hi, I would like to know if it's possible to install mandelbulber in a custom directory, say e.g ~/usr/local/bin  instead of /usr/bin and if so how to do it.
I'm under linux (sabayon linux).
I tried to do it by hand but got:
Let me add that I know next to nothing in coding, usually I use ./configure.sh --help for options then make and make install when I'm forced to use sources.
Thanks in advance.

I'm not quite sure - on windows you can, but I never tried if it really works, as many paths are fix regardless where your special folders are. Even if it might work, I don't think it's a good idea. This is an annoyance for me too...

Yes you can
on my OpenSUSE 12.2 64 OS
i have the SVN checkout of Mandelbulber installed to my SUSE 12 folder on my DATA drive
a mounted drive i share with ScientificLinux6.3 ,in a secondary  tree
/DATA/SUSE12/bin
/DATA/SUSE12/include
/DATA/SUSE12/lib64
/DATA/SUSE12/share

however
not many OS's have /usr/local/??? in the system $PATH

and the first time you fire it up a "~/.mandelbulber" folder will be made

now to install it to /usr/local
you WILL need to set some system settings
-- system wide --
/etc/profile.local
or
/etc/profile ( but this file SHOULD have a warning about being auto created and auto overwrote )

add "/usr/local/Mandelbuliber/bin" & "/usr/local/Mandelbuliber/share/mandelbulber  in the system $PATH

that must be a typo
i have never in 10 years seen a configure script that was a bash shell script
a few "BUILD.sh's " and some cmake and qmake shell scripts

I think everything is fine, mandelbulber is already open but cannot find the default settings; just copy them manually.

Thank you all for your replies. I managed to make it work following your hints.