File::Spec is wiser at chosing a temp directory

hive_config.json

@@ -9,7 +9,7 @@
     "Meadow" : {
         "REMARKS" : {
             "HOWTO"             : "These parameters are optional. When setting them, move them out of the REMARKS section at the same time",
-            "BaseTempDirectory" : "Where to create temporary directories for workers. When null or missing, workers will use /tmp",
+            "BaseTempDirectory" : "Where to create temporary directories for workers. When null or missing, workers will ask File::Spec, which choses $TMPDIR or /tmp",
             "RunWorkerPath"     : "The path of runWorker.pl . When null or missing, beekeeper will use $EHIVE_ROOT_DIR or its own path. When RunWorkerPath is '', beekeeper assumes runWorker.pl is in $PATH"
         },
         "CleanupTempDirectoryKilledWorkers" : 0,

modules/Bio/EnsEMBL/Hive/Worker.pm

@@ -76,6 +76,7 @@ use strict;
 use warnings;
 use POSIX;
 use File::Path 'make_path';
+use File::Spec;
 
 use Bio::EnsEMBL::Hive::AnalysisStats;
 use Bio::EnsEMBL::Hive::Limiter;
@@ -927,15 +928,16 @@ sub set_log_directory_name {
 
   Title       : set_temp_directory_name
   Description : Generates and sets the name of a temporary directory suitable for this worker.
-                It will be under the base directory requested by $base_temp_dir, or /tmp
-                otherwise, and includes worker attributes to make the path unique.
+                It will be under the base directory requested by $base_temp_dir, or the standard
+                location otherwise (as advised by File::Spec), and includes worker attributes
+                to make the path unique.
 
 =cut
 
 sub set_temp_directory_name {
     my ($self, $base_temp_dir) = @_;
 
-    $base_temp_dir //= '/tmp';
+    $base_temp_dir //= File::Spec->tmpdir();
 
     my $temp_directory_name;
     if ($self->adaptor) {