diff --git a/doc/manual/expressions/builder-syntax.xml b/doc/manual/expressions/builder-syntax.xml
deleted file mode 100644
index e51bade44..000000000
--- a/doc/manual/expressions/builder-syntax.xml
+++ /dev/null
@@ -1,119 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-      xmlns:xlink="http://www.w3.org/1999/xlink"
-      xmlns:xi="http://www.w3.org/2001/XInclude"
-      version="5.0"
-      xml:id='sec-builder-syntax'>
-
-<title>Builder Syntax</title>
-
-<example xml:id='ex-hello-builder'><title>Build script for GNU Hello
-(<filename>builder.sh</filename>)</title>
-<programlisting>
-source $stdenv/setup <co xml:id='ex-hello-builder-co-1' />
-
-PATH=$perl/bin:$PATH <co xml:id='ex-hello-builder-co-2' />
-
-tar xvfz $src <co xml:id='ex-hello-builder-co-3' />
-cd hello-*
-./configure --prefix=$out <co xml:id='ex-hello-builder-co-4' />
-make <co xml:id='ex-hello-builder-co-5' />
-make install</programlisting>
-</example>
-
-<para><xref linkend='ex-hello-builder' /> shows the builder referenced
-from Hello's Nix expression (stored in
-<filename>pkgs/applications/misc/hello/ex-1/builder.sh</filename>).
-The builder can actually be made a lot shorter by using the
-<emphasis>generic builder</emphasis> functions provided by
-<varname>stdenv</varname>, but here we write out the build steps to
-elucidate what a builder does.  It performs the following
-steps:</para>
-
-<calloutlist>
-
-  <callout arearefs='ex-hello-builder-co-1'>
-
-    <para>When Nix runs a builder, it initially completely clears the
-    environment (except for the attributes declared in the
-    derivation).  For instance, the <envar>PATH</envar> variable is
-    empty<footnote><para>Actually, it's initialised to
-    <filename>/path-not-set</filename> to prevent Bash from setting it
-    to a default value.</para></footnote>.  This is done to prevent
-    undeclared inputs from being used in the build process.  If for
-    example the <envar>PATH</envar> contained
-    <filename>/usr/bin</filename>, then you might accidentally use
-    <filename>/usr/bin/gcc</filename>.</para>
-
-    <para>So the first step is to set up the environment.  This is
-    done by calling the <filename>setup</filename> script of the
-    standard environment.  The environment variable
-    <envar>stdenv</envar> points to the location of the standard
-    environment being used.  (It wasn't specified explicitly as an
-    attribute in <xref linkend='ex-hello-nix' />, but
-    <varname>mkDerivation</varname> adds it automatically.)</para>
-
-  </callout>
-
-  <callout arearefs='ex-hello-builder-co-2'>
-
-    <para>Since Hello needs Perl, we have to make sure that Perl is in
-    the <envar>PATH</envar>.  The <envar>perl</envar> environment
-    variable points to the location of the Perl package (since it
-    was passed in as an attribute to the derivation), so
-    <filename><replaceable>$perl</replaceable>/bin</filename> is the
-    directory containing the Perl interpreter.</para>
-
-  </callout>
-
-  <callout arearefs='ex-hello-builder-co-3'>
-
-    <para>Now we have to unpack the sources.  The
-    <varname>src</varname> attribute was bound to the result of
-    fetching the Hello source tarball from the network, so the
-    <envar>src</envar> environment variable points to the location in
-    the Nix store to which the tarball was downloaded.  After
-    unpacking, we <command>cd</command> to the resulting source
-    directory.</para>
-
-    <para>The whole build is performed in a temporary directory
-    created in <varname>/tmp</varname>, by the way.  This directory is
-    removed after the builder finishes, so there is no need to clean
-    up the sources afterwards.  Also, the temporary directory is
-    always newly created, so you don't have to worry about files from
-    previous builds interfering with the current build.</para>
-
-  </callout>
-
-  <callout arearefs='ex-hello-builder-co-4'>
-
-    <para>GNU Hello is a typical Autoconf-based package, so we first
-    have to run its <filename>configure</filename> script.  In Nix
-    every package is stored in a separate location in the Nix store,
-    for instance
-    <filename>/nix/store/9a54ba97fb71b65fda531012d0443ce2-hello-2.1.1</filename>.
-    Nix computes this path by cryptographically hashing all attributes
-    of the derivation.  The path is passed to the builder through the
-    <envar>out</envar> environment variable.  So here we give
-    <filename>configure</filename> the parameter
-    <literal>--prefix=$out</literal> to cause Hello to be installed in
-    the expected location.</para>
-
-  </callout>
-
-  <callout arearefs='ex-hello-builder-co-5'>
-
-    <para>Finally we build Hello (<literal>make</literal>) and install
-    it into the location specified by <envar>out</envar>
-    (<literal>make install</literal>).</para>
-
-  </callout>
-
-</calloutlist>
-
-<para>If you are wondering about the absence of error checking on the
-result of various commands called in the builder: this is because the
-shell script is evaluated with Bash's <option>-e</option> option,
-which causes the script to be aborted if any command fails without an
-error check.</para>
-
-</section>
\ No newline at end of file
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index 2a95c7e69..157fc1db1 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -53,14 +53,6 @@ bool derivationIsImpure(DerivationType dt) {
     abort();
 }
 
-const StorePath BasicDerivation::findOutput(const Store & store, const string & id) const
-{
-    auto i = outputs.find(id);
-    if (i == outputs.end())
-        throw Error("derivation has no output '%s'", id);
-    return i->second.path(store, name);
-}
-
 
 bool BasicDerivation::isBuiltin() const
 {
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 04cf14cba..b1cda85cb 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -90,10 +90,6 @@ struct BasicDerivation
     BasicDerivation() { }
     virtual ~BasicDerivation() { };
 
-    /* Return the path corresponding to the output identifier `id' in
-       the given derivation. */
-    const StorePath findOutput(const Store & store, const std::string & id) const;
-
     bool isBuiltin() const;
 
     /* Return true iff this is a fixed-output derivation. */
diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc
index 1a36dbee3..ddd036070 100644
--- a/src/nix-env/nix-env.cc
+++ b/src/nix-env/nix-env.cc
@@ -381,7 +381,8 @@ static void queryInstSources(EvalState & state,
 
                 if (path.isDerivation()) {
                     elem.setDrvPath(state.store->printStorePath(path));
-                    elem.setOutPath(state.store->printStorePath(state.store->derivationFromPath(path).findOutput(*state.store, "out")));
+                    auto outputs = state.store->queryDerivationOutputMap(path);
+                    elem.setOutPath(state.store->printStorePath(outputs.at("out")));
                     if (name.size() >= drvExtension.size() &&
                         string(name, name.size() - drvExtension.size()) == drvExtension)
                         name = string(name, 0, name.size() - drvExtension.size());