diff --git a/10seconds_install b/10seconds_install
index 9be2e3bf..02c54ec7 100644
--- a/10seconds_install
+++ b/10seconds_install
@@ -12,7 +12,7 @@
 #
 # It first tries to install it globally.
 # If that fails, it does a personal installation.
-# If that fails, it does copies to $HOME/bin
+# If that fails, it copies to $HOME/bin
 
 LATEST=$(wget -qO- http://ftpmirror.gnu.org/parallel | perl -ne '/(parallel-\d{8})/ and print $1."\n"' | sort | tail -n1)
 if test \! -d $LATEST/src/; then
diff --git a/doc/release_new_version b/doc/release_new_version
index ff406bd9..738b7f04 100644
--- a/doc/release_new_version
+++ b/doc/release_new_version
@@ -195,9 +195,9 @@ cc:Sandro Cazzaniga <kharec@mandriva.org>,
    Ryoichiro Suzuki <ryoichiro.suzuki@gmail.com>,
    Jesse Alama <jesse.alama@gmail.com>
 
-Subject: GNU Parallel 20130722 ('') released
+Subject: GNU Parallel 20130722 ('Engelbart') released
 
-GNU Parallel 20130722 ('') has been released. It is
+GNU Parallel 20130722 ('Engelbart') has been released. It is
 available for download at: http://ftp.gnu.org/gnu/parallel/
 
 Very few changes so this can be considered a stable release.
diff --git a/src/parallel b/src/parallel
index 83b39ae4..8c1026db 100755
--- a/src/parallel
+++ b/src/parallel
@@ -39,6 +39,12 @@ if(not $ENV{SHELL}) {
     ::warning("\$SHELL not set. Using /bin/sh.\n");
     $ENV{SHELL} = "/bin/sh";
 }
+if(not $ENV{HOME}) {
+    # $ENV{HOME} is sometimes not set if called from PHP
+    ::warning("\$HOME not set. Using /tmp\n");
+    $ENV{HOME} = "/tmp";
+}
+
 save_sig_stdin_stdout_stderr();
 
 parse_options();
diff --git a/testsuite/tests-to-run/parallel-local4.sh b/testsuite/tests-to-run/parallel-local4.sh
index 2bdd3ffd..630fce82 100644
--- a/testsuite/tests-to-run/parallel-local4.sh
+++ b/testsuite/tests-to-run/parallel-local4.sh
@@ -22,4 +22,9 @@ echo '### -l -n with pipe'
 echo '### bug #39360: --joblog does not work with --pipe'
   seq 100 | parallel --joblog - --pipe wc | tr '0-9' 'X'
 
+echo '### How do we deal with missing $HOME'
+   unset HOME; stdout perl -w $(which parallel) echo ::: 1 2 3
+
+echo '### How do we deal with missing $SHELL'
+   unset SHELL; stdout perl -w $(which parallel) echo ::: 1 2 3
 EOF
diff --git a/testsuite/wanted-results/parallel-local4 b/testsuite/wanted-results/parallel-local4
index 5905b824..64d5c185 100644
--- a/testsuite/wanted-results/parallel-local4
+++ b/testsuite/wanted-results/parallel-local4
@@ -93,3 +93,17 @@ echo '### bug #39360: --joblog does not work with --pipe'
 Seq	Host	Starttime	Runtime	Send	Receive	Exitval	Signal	Command
 X	:	XXXXXXXXXX.XXX	X.XXX	X	X	X	X	wc 
     XXX     XXX     XXX
+echo '### How do we deal with missing $HOME'
+### How do we deal with missing $HOME
+   unset HOME; stdout perl -w $(which parallel) echo ::: 1 2 3
+parallel: Warning: $HOME not set. Using /tmp
+1
+2
+3
+echo '### How do we deal with missing $SHELL'
+### How do we deal with missing $SHELL
+   unset SHELL; stdout perl -w $(which parallel) echo ::: 1 2 3
+parallel: Warning: $SHELL not set. Using /bin/sh.
+1
+2
+3