nixpkgs/pkgs/baseenv/setup.sh

# Add the directory containing the GCC wrappers to the PATH.
export PATH=@OUT@/bin:$PATH

# Recursively add all envpkgs to the relevant environment variables.
addtoenv()
{
    envpkgs="$envpkgs $1"

    if test -d $1/bin; then
        export PATH=$1/bin:$PATH
    fi

    if test -d $1/lib; then
	export NIX_CFLAGS_LINK="-L$1/lib $NIX_CFLAGS_LINK"
	export NIX_LDFLAGS="-rpath $1/lib $NIX_LDFLAGS"
    fi

    if test -d $1/lib/pkgconfig; then
        export PKG_CONFIG_PATH=$1/lib/pkgconfig:$PKG_CONFIG_PATH
    fi

    if test -f $1/envpkgs; then
        for i in $(cat $1/envpkgs); do
            addtoenv $i
        done
    fi
}

oldenvpkgs=$envpkgs
envpkgs=

for i in $oldenvpkgs; do
    addtoenv $i
done

# Add the output as an rpath.
export NIX_LDFLAGS="-rpath $out/lib $NIX_LDFLAGS"

# Strip debug information by default.
export NIX_STRIP_DEBUG=1