diff --git a/envfiles/stacks/1.46 b/envfiles/stacks/1.46
index 6bc25711d373bfef852b4c4a0be254b53ec45460..a7c9003d3eca3880fc04631b027f9c448435bd29 100644
--- a/envfiles/stacks/1.46
+++ b/envfiles/stacks/1.46
@@ -14,8 +14,10 @@ set rel [uname release]
 global prodlist
 
 if { $rel == "2.6.32-504.16.2.el6.x86_64" }  {
-  set    prodlist {gcc/4.9 libz/1.2.8 \
+  set prodlist {gcc/4.9 libz/1.2.8 \
                  libc/2.14}
+} else {
+  set prodlist { }
 }
 
 set is_module_rm [module-info mode remove]
diff --git a/envfiles/stacks/1.48 b/envfiles/stacks/1.48
index 84bd8b50112272975635e4aa08ec64b4380d1986..4c1c8b641393a0bcc4a52f9a6825855fff904419 100644
--- a/envfiles/stacks/1.48
+++ b/envfiles/stacks/1.48
@@ -14,9 +14,12 @@ set rel [uname release]
 global prodlist
 
 if { $rel == "2.6.32-504.16.2.el6.x86_64" }  {
-  set    prodlist {gcc/4.9 libz/1.2.8 \
+  set prodlist {gcc/4.9 libz/1.2.8 \
                  libc/2.14}
 }
+} else {
+  set prodlist { }
+}
 
 set is_module_rm [module-info mode remove]
 
diff --git a/envfiles/stacks/2.0-beta b/envfiles/stacks/2.0-beta
index 535caa64a84a35ecd65f26fa06ecf2ce1552739f..c2febf2030ae19bac0d64eaa41780e40e90423d5 100644
--- a/envfiles/stacks/2.0-beta
+++ b/envfiles/stacks/2.0-beta
@@ -14,8 +14,10 @@ set rel [uname release]
 global prodlist
 
 if { $rel == "2.6.32-504.16.2.el6.x86_64" }  {
-  set    prodlist {gcc/4.9 libz/1.2.8 \
+  set prodlist {gcc/4.9 libz/1.2.8 \
                  libc/2.14}
+} else {
+  set prodlist { }
 }
 
 set is_module_rm [module-info mode remove]
diff --git a/envfiles/stacks/2.0.10a-beta b/envfiles/stacks/2.0.10a-beta
index 4e40df18127c2105dc4037b3942c90224c76cb8c..f37283d4597d455f17c0372971a59909c5559fa0 100644
--- a/envfiles/stacks/2.0.10a-beta
+++ b/envfiles/stacks/2.0.10a-beta
@@ -14,10 +14,13 @@ set rel [uname release]
 global prodlist
 
 if { $rel == "2.6.32-504.16.2.el6.x86_64" }  {
-  set    prodlist {gcc/4.9 libz/1.2.8 \
+  set prodlist {gcc/4.9 libz/1.2.8 \
                  libc/2.14}
+} else {
+  set prodlist { }
 }
 
+
 set is_module_rm [module-info mode remove]
 
 catch {set modulehomes $env(MODULEPATH)}