#### Linux From Scratch - Version 7.9

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# vii. Host System Requirements

Your host system should have the following software with the minimum versions indicated. This should not be an issue for most modern Linux distributions. Also note that many distributions will place software headers into separate packages, often in the form of “<package-name>-devel” or “<package-name>-dev”. Be sure to install those if your distribution provides them.

Earlier versions of the listed software packages may work, but has not been tested.

- Bash-3.2 (/bin/sh should be a symbolic or hard link to bash)

- Binutils-2.17 (Versions greater than 2.26 are not recommended as they have not been tested)

- Bison-2.3 (/usr/bin/yacc should be a link to bison or small script that executes bison)

- Bzip2-1.0.4

- Coreutils-6.9

- Diffutils-2.8.1

- Findutils-4.2.31

- Gawk-4.0.1 (/usr/bin/awk should be a link to gawk)

- GCC-4.7 including the C++ compiler, g++ (Versions greater than 5.3.0 are not recommended as they have not been tested)

  ### Note

  On some distributions, there have been reports that some libraries used by gcc can be in an inconsistent state and that this interferes with building some LFS packages. To check this, look in /usr/lib and possibly /usr/lib64 for libgmp.la, libmpfr.la, and libmpc.la. Either all three should be present or absent, but not only one or two. If the problem exists on your system, either rename or delete the .la files or install the appropriate missing package.

- Glibc-2.11 (Versions greater than 2.23 are not recommended as they have not been tested)

- Grep-2.5.1a

- Gzip-1.3.12

- Linux Kernel-2.6.32

  The reason for the kernel version requirement is that we specify that version when building glibc in Chapter 6 at the recommendation of the developers. It is also required by udev.

  If the host kernel is earlier than 2.6.32 you will need to replace the kernel with a more up to date version. There are two ways you can go about this. First, see if your Linux vendor provides a 2.6.32 or later kernel package. If so, you may wish to install it. If your vendor doesn't offer an acceptable kernel package, or you would prefer not to install it, you can compile a kernel yourself. Instructions for compiling the kernel and configuring the boot loader (assuming the host uses GRUB) are located in Chapter 8.

- M4-1.4.10

- Make-3.81

- Patch-2.5.4

- Perl-5.8.8

- Sed-4.1.5

- Tar-1.22

- Texinfo-4.7

- Xz-5.0.0

Note that the symlinks mentioned above are required to build an LFS system using the instructions contained within this book. Symlinks that point to other software (such as dash, mawk, etc.) may work, but are not tested or supported by the LFS development team, and may require either deviation from the instructions or additional patches to some packages.

##

To see whether your host system has all the appropriate versions, and the ability to compile programs, run the following:

    cat > version-check.sh << "EOF"
    #!/bin/bash
    # Simple script to list version numbers of critical development tools
    export LC_ALL=C
    bash --version | head -n1 | cut -d" " -f2-4
    MYSH=$(readlink -f /bin/sh)
    echo "/bin/sh -> $MYSH"
    echo $MYSH | grep -q bash || echo "ERROR: /bin/sh does not point to bash"
    unset MYSH

    echo -n "Binutils: "; ld --version | head -n1 | cut -d" " -f3-
    bison --version | head -n1

    if [ -h /usr/bin/yacc ]; then
      echo "/usr/bin/yacc -> `readlink -f /usr/bin/yacc`";
    elif [ -x /usr/bin/yacc ]; then
      echo yacc is `/usr/bin/yacc --version | head -n1`
    else
      echo "yacc not found"
    fi

    bzip2 --version 2>&1 < /dev/null | head -n1 | cut -d" " -f1,6-
    echo -n "Coreutils: "; chown --version | head -n1 | cut -d")" -f2
    diff --version | head -n1
    find --version | head -n1
    gawk --version | head -n1

    if [ -h /usr/bin/awk ]; then
      echo "/usr/bin/awk -> `readlink -f /usr/bin/awk`";
    elif [ -x /usr/bin/awk ]; then
      echo awk is `/usr/bin/awk --version | head -n1`
    else
      echo "awk not found"
    fi

    gcc --version | head -n1
    g++ --version | head -n1
    ldd --version | head -n1 | cut -d" " -f2-  # glibc version
    grep --version | head -n1
    gzip --version | head -n1
    cat /proc/version
    m4 --version | head -n1
    make --version | head -n1
    patch --version | head -n1
    echo Perl `perl -V:version`
    sed --version | head -n1
    tar --version | head -n1
    makeinfo --version | head -n1
    xz --version | head -n1

    echo 'int main(){}' > dummy.c && g++ -o dummy dummy.c
    if [ -x dummy ]
      then echo "g++ compilation OK";
      else echo "g++ compilation failed"; fi
    rm -f dummy.c dummy
    EOF

    bash version-check.sh

Also check for some library consistency:

    cat > library-check.sh << "EOF"
    #!/bin/bash
    for lib in lib{gmp,mpfr,mpc}.la; do
      echo $lib: $(if find /usr/lib* -name $lib|
                   grep -q $lib;then :;else echo not;fi) found
    done
    unset lib
    EOF

    bash library-check.sh

The files identified by this script should be all present or all absent, but not only one or two present.

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