1 files changed, 9 insertions, 1 deletions
diff --git a/bin/build-twttr-world b/bin/build-twttr-world
index 85d4f4e..a2fe9b3 100755
--- a/bin/build-twttr-world
+++ b/bin/build-twttr-world
@@ -1,5 +1,13 @@
 #!/bin/bash
 
+SOURCE_ROOT="${HOME}/src/source"
+
+if [ ! -d "${SOURCE_ROOT}" ]; then
+  echo "It looks like ${SOURCE_ROOT} is not available."
+  exit 1
+fi
+
+
 TARGETS=(
   'science/src/python/twitter/checkstyle:check'
   'science/src/python/twitter/messaging/tools/:bookkeeper'
@@ -10,7 +18,7 @@ TARGETS=(
   'science/src/python/twitter/messaging/tools/:proxy-admin'
 )
 
-cd ~/src/source
+cd "${SOURCE_ROOT}"
 
 for target in "${TARGETS[@]}"; do
   echo -n "Build $target"