Installation of Grep
Prepare Grep to be compiled:
./configure --prefix=/tools \
    --disable-perl-regexp --with-included-regex
The meaning of the configure switches:
--disable-perl-regexp: This makes sure
that grep does not get linked against a PCRE library
that may be present on the host, but would not be available once we enter the
chroot environment.
--with-included-regex: This ensures that
Grep uses its internal regular expression code.  Without it, it will use
the code from Glibc, which is known to be slightly buggy.
Compile the programs:
make 
This package has a testsuite available which can perform a number of 
checks to ensure it built correctly.  Should you choose to run it, the 
following command will do so:
make check
Then install them and their documentation:
make install