diff --git a/doc/manual/installation/prerequisites-source.xml b/doc/manual/installation/prerequisites-source.xml
index e7bdcf966..fa6da9b1e 100644
--- a/doc/manual/installation/prerequisites-source.xml
+++ b/doc/manual/installation/prerequisites-source.xml
@@ -8,6 +8,14 @@
 
 <itemizedlist>
 
+  <listitem><para>GNU Autoconf
+  (<link xlink:href="https://www.gnu.org/software/autoconf/"/>)
+  and the autoconf-archive macro collection
+  (<link xlink:href="https://www.gnu.org/software/autoconf-archive/"/>).
+  These are only needed to run the bootstrap script, and are not necessary
+  if your source distribution came with a pre-built
+  <literal>./configure</literal> script.</para></listitem>
+
   <listitem><para>GNU Make.</para></listitem>
   
   <listitem><para>Bash Shell. The <literal>./configure</literal> script
diff --git a/scripts/install-systemd-multi-user.sh b/scripts/install-systemd-multi-user.sh
index bef3ac4f9..e0201d53b 100755
--- a/scripts/install-systemd-multi-user.sh
+++ b/scripts/install-systemd-multi-user.sh
@@ -88,7 +88,7 @@ poly_configure_nix_daemon_service() {
           systemctl start nix-daemon.socket
 
     _sudo "to start the nix-daemon.service" \
-          systemctl start nix-daemon.service
+          systemctl restart nix-daemon.service
 
 }
 
diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
index d22767967..07c58de92 100755
--- a/src/nix-build/nix-build.cc
+++ b/src/nix-build/nix-build.cc
@@ -97,7 +97,11 @@ static void _main(int argc, char * * argv)
     std::string outLink = "./result";
 
     // List of environment variables kept for --pure
-    std::set<string> keepVars{"HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER", "NIX_BUILD_SHELL", "SHLVL"};
+    std::set<string> keepVars{
+        "HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM",
+        "IN_NIX_SHELL", "TZ", "PAGER", "NIX_BUILD_SHELL", "SHLVL",
+        "http_proxy", "https_proxy", "ftp_proxy", "all_proxy", "no_proxy"
+    };
 
     Strings args;
     for (int i = 1; i < argc; ++i)
@@ -423,13 +427,18 @@ static void _main(int argc, char * * argv)
            lose the current $PATH directories. */
         auto rcfile = (Path) tmpDir + "/rc";
         writeFile(rcfile, fmt(
-                (keepTmp ? "" : "rm -rf '%1%'; "s) +
+                R"(_nix_shell_clean_tmpdir() { rm -rf %1%; }; )"s +
+                (keepTmp ?
+                    "trap _nix_shell_clean_tmpdir EXIT; "
+                    "exitHooks+=(_nix_shell_clean_tmpdir); "
+                    "failureHooks+=(_nix_shell_clean_tmpdir); ":
+                    "_nix_shell_clean_tmpdir; ") +
                 (pure ? "" : "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;") +
                 "%2%"
                 "dontAddDisableDepTrack=1; "
                 "[ -e $stdenv/setup ] && source $stdenv/setup; "
                 "%3%"
-                "PATH=\"%4%:$PATH\"; "
+                "PATH=%4%:\"$PATH\"; "
                 "SHELL=%5%; "
                 "set +e; "
                 R"s([ -n "$PS1" ] && PS1='\n\[\033[1;32m\][nix-shell:\w]\$\[\033[0m\] '; )s"
@@ -438,12 +447,12 @@ static void _main(int argc, char * * argv)
                 "shopt -u nullglob; "
                 "unset TZ; %6%"
                 "%7%",
-                (Path) tmpDir,
+                shellEscape(tmpDir),
                 (pure ? "" : "p=$PATH; "),
                 (pure ? "" : "PATH=$PATH:$p; unset p; "),
-                dirOf(*shell),
-                *shell,
-                (getenv("TZ") ? (string("export TZ='") + getenv("TZ") + "'; ") : ""),
+                shellEscape(dirOf(*shell)),
+                shellEscape(*shell),
+                (getenv("TZ") ? (string("export TZ=") + shellEscape(getenv("TZ")) + "; ") : ""),
                 envCommand));
 
         Strings envStrs;