[Buildroot] Questions related to "Incorrect selection of the C library" error

[stl]

Hello all,

I am trying to port Buildroot for a new architecture and I am facing
the following error when I build it:

Checking external toolchain settings
Incorrect selection of the C library

The following lib (ld*-uClibc.so.*) is missing in my /lib/ dir.
Where does this lib come from?

In my .config, I have selected BR2_TOOLCHAIN_EXTERNAL=y
and I have set the path for my toolchain, and the prefix.

But where can I set the path for my installed uClibc directory?
( /usr/<arch>-linux-uclibc )

Thanks in advance for your help.
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