From ed4135f14804f441400f15ca981b4f7c48d65bc6 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 28 Mar 2020 17:05:31 +0100
Subject: Update waf wrapper to print submodule help message

---
 waf | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/waf b/waf
index 305e321..58d14c3 100755
--- a/waf
+++ b/waf
@@ -2,15 +2,26 @@
 
 # Minimal waf script for projects that include waflib directly
 
-from waflib import Context, Scripting
-
+import sys
 import inspect
 import os
 
+try:
+    from waflib import Context, Scripting
+except Exception as e:
+    sys.stderr.write('error: Failed to import waf (%s)\n' % e)
+    if os.path.exists('.git'):
+        sys.stderr.write("Are submodules up to date? "
+                         "Try 'git submodule update --init --recursive'\n")
+
+    sys.exit(1)
+
+
 def main():
     script_path = os.path.abspath(inspect.getfile(inspect.getmodule(main)))
     project_path = os.path.dirname(os.path.realpath(script_path))
     Scripting.waf_entry_point(os.getcwd(), Context.WAFVERSION, project_path)
 
+
 if __name__ == '__main__':
     main()
-- 
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