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Why in Linux from scratch they are passing --prefix=/usr to configure scripts? For example here is the glibc configure script

../configure                             \
      --prefix=/usr                      \
      --host=$LFS_TGT                    \
      --build=$(../scripts/config.guess) \
      --enable-kernel=3.2                \
      --with-headers=$LFS/usr/include    \
      libc_cv_slibdir=/usr/lib

Shouldnt it be --prefix=$LFS/usr so it gets installed there and not in the host system's /usr?

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The --prefix argument to configure determines where the compiled program should expect to be installed. The ultimate goal is to have a system where /usr contains the programs being built, so they are configured with the expectation that they will run from /usr.

Installation itself doesn’t have to happen in /usr as viewed from the host system. In LFS, build and installation is done in a chroot anyway; in other scenarios, the installation itself is done with a prefix (e.g. using DESTDIR).

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