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diff -up firefox-68.0/python/mozbuild/mozbuild/controller/building.py.old firefox-68.0/python/mozbuild/mozbuild/controller/building.py
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--- firefox-68.0/python/mozbuild/mozbuild/controller/building.py.old	2019-05-29 10:46:55.403262995 +0200
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+++ firefox-68.0/python/mozbuild/mozbuild/controller/building.py	2019-05-29 10:47:42.691176970 +0200
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@@ -571,7 +571,7 @@ class TerminalLoggingHandler(logging.Han
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             if self.footer:
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                 self.footer.clear()
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-            self.fh.write(msg)
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+            self.fh.write(msg.encode("utf-8"))
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             self.fh.write('\n')
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             if self.footer: