diff --git a/script/bootstrap b/script/bootstrap
index 832efa41..36c76ada 100755
--- a/script/bootstrap
+++ b/script/bootstrap
@@ -6,6 +6,12 @@
 ###############################################################################
 # Build cpu dependencies.
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 # Do not set Exit on Error in scripts that will be sourced
 # set -o errexit
 
diff --git a/script/build b/script/build
index 6dd2f6fc..b6e1568d 100755
--- a/script/build
+++ b/script/build
@@ -6,6 +6,12 @@
 ###############################################################################
 # Build cpu.
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 if [ "$0" = "$BASH_SOURCE" ]
 then
   set -o errexit
diff --git a/script/clean b/script/clean
index bc69b5ad..79f54c65 100755
--- a/script/clean
+++ b/script/clean
@@ -6,6 +6,12 @@
 ###############################################################################
 # Clean cpu.
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 if [ "$0" = "$BASH_SOURCE" ]
 then
   set -o errexit
diff --git a/script/install b/script/install
index 257b61ea..fdf54e00 100755
--- a/script/install
+++ b/script/install
@@ -6,6 +6,12 @@
 ###############################################################################
 # Install cpu.
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 if [ "$0" = "$BASH_SOURCE" ]
 then
   set -o errexit
diff --git a/script/lint b/script/lint
index c9caeb8d..060119d3 100755
--- a/script/lint
+++ b/script/lint
@@ -6,6 +6,12 @@
 ###############################################################################
 # Check code for issues.
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 if [ "$0" = "$BASH_SOURCE" ]
 then
   set -o errexit
diff --git a/script/stress b/script/stress
index 052de609..ad7ebfda 100755
--- a/script/stress
+++ b/script/stress
@@ -18,6 +18,12 @@
 #      (if there's failure, test's failed)
 ###############################################################################
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 ## start of boilerplate to switch to project root ------------------------------
 script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 proj_dir="$( dirname "${script_dir}" )"
diff --git a/script/test b/script/test
index 429d2718..954b6a1b 100755
--- a/script/test
+++ b/script/test
@@ -6,6 +6,12 @@
 ###############################################################################
 # Run basic tests on base.
 
+if [ -z "$BASH_VERSION" ]
+then
+  echo "This script must be run under bash"
+  exit 1
+fi
+
 if [ "$0" = "$BASH_SOURCE" ]
 then
   set -o errexit