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-rw-r--r--tools/shared.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/shared.py b/tools/shared.py
index 2c83bdeb..bfb338d9 100644
--- a/tools/shared.py
+++ b/tools/shared.py
@@ -666,6 +666,7 @@ class Building:
b = open(filename, 'r').read(4)
if b[0] == 'B' and b[1] == 'C':
return True
+ # on OS X, there is a 20-byte prefix
elif ord(b[0]) == 222 and ord(b[1]) == 192 and ord(b[2]) == 23 and ord(b[3]) == 11:
b = open(filename, 'r').read(24)
return b[20] == 'B' and b[21] == 'C'