4 files changed, 14 insertions, 0 deletions
diff --git a/Scripts/build-version.pl b/Scripts/build-version.pl
index cd56310d..fa12bfdb 100755
--- a/Scripts/build-version.pl
+++ b/Scripts/build-version.pl
@@ -11,6 +11,7 @@
 ##              Subversion revision.
 
 use strict;
+use warnings;
 
 die "$0: Must be run from within Xcode. Exiting..." unless $ENV{"BUILT_PRODUCTS_DIR"};
 
diff --git a/Scripts/build.sh b/Scripts/build.sh
index 149705cb..2e48dacc 100755
--- a/Scripts/build.sh
+++ b/Scripts/build.sh
@@ -11,6 +11,12 @@
 ##              into Xcode's 'Run Scripts' build phase to make it easier to work with. As such this script
 ##              can only be run by Xcode.
 
+if [ "${BUILT_PRODUCTS_DIR}x" == 'x' ]
+then
+	echo 'This script should only be run by Xcode. Exiting...'
+	exit 1
+fi
+
 BUILD_PRODUCT="${BUILT_PRODUCTS_DIR}/${TARGET_NAME}${WRAPPER_SUFFIX}"
 
 echo 'Updating build version...'
diff --git a/Scripts/localize.sh b/Scripts/localize.sh
index 911cf8ea..e3de6957 100755
--- a/Scripts/localize.sh
+++ b/Scripts/localize.sh
@@ -9,6 +9,12 @@
 ##
 ## Description: Localizes all of the application's NIB files. This script should only be run by Xcode.
 
+if [ "${BUILT_PRODUCTS_DIR}x" == 'x' ]
+then
+	echo 'This script should only be run by Xcode. Exiting...'
+	exit 1
+fi
+
 echo "Running genstrings to update 'Localizable.strings'..."
 
 # Update 'Localizable.strings' by running genstrings(1)
diff --git a/Scripts/package-application.sh b/Scripts/package-application.sh
index e00c91a5..69e14058 100755
--- a/Scripts/package-application.sh
+++ b/Scripts/package-application.sh
@@ -12,6 +12,7 @@
 
 # Ensure the path to the application has been supplied - should have occurred when the
 # script was run by selecting "Distribution" target and building.
+
 if [ $# -eq 0 ]
 then
     echo 'The path to the application must be supplied when running this script.'