nixpkgs/pkgs/development/interpreters/perl/builder.sh

. $stdenv/setup

postUnpack=postUnpack
postUnpack() {
    # Perl's Configure messes with PATH.  We can't have that, so we
    # patch it.  Yeah, this is an ugly hack.
    if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
        cat Configure | \
            grep -v '^paths=' | \
            grep -v '^locincpth=' | \
            grep -v '^xlibpth=' | \
            grep -v '^glibpth=' | \
            grep -v '^loclibpth=' | \
            grep -v '^locincpth=' | \
            cat > Configure.tmp
        mv Configure.tmp Configure
        chmod +x Configure
    fi
}

if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
    GLIBC=$(cat $NIX_GCC/nix-support/orig-glibc)
    extraflags="-Dlocincpth=$GLIBC/include -Dloclibpth=$GLIBC/lib"
fi

configureScript=./Configure
configureFlags="-de -Dcc=gcc -Dprefix=$out -Uinstallusrbinperl $extraflags"
dontAddPrefix=1

genericBuild