1 files changed, 4 insertions, 4 deletions
diff --git a/build.py b/build.py
index 4cff80a50..34cc19f5b 100755
--- a/build.py
+++ b/build.py
@@ -25,10 +25,6 @@ import sys
 
 def android_path(path=''):
     top = os.getenv('ANDROID_BUILD_TOP', '')
-    if not top:
-        sys.exit('ANDROID_BUILD_TOP not set. Cannot continue.\n'
-                 'Please set ANDROID_BUILD_TOP to point to the root of an '
-                 'Android tree.')
     return os.path.realpath(os.path.join(top, path))
 
 
@@ -98,6 +94,10 @@ def sysroot_path(toolchain):
 def main():
     args = ArgParser().parse_args()
 
+    if 'ANDROID_BUILD_TOP' not in os.environ:
+        top = os.path.join(os.path.dirname(__file__), '../..')
+        os.environ['ANDROID_BUILD_TOP'] = os.path.realpath(top)
+
     os.chdir(android_path('toolchain/gcc'))
 
     toolchain_path = android_path('toolchain')