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diff -ur vigra-1.11.1/vigranumpy/src/core/vigranumpycore.cxx vigra-1.11.1.new/vigranumpy/src/core/vigranumpycore.cxx
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--- vigra-1.11.1/vigranumpy/src/core/vigranumpycore.cxx	2017-05-19 16:01:08.000000000 +0100
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+++ vigra-1.11.1.new/vigranumpy/src/core/vigranumpycore.cxx	2018-08-23 00:08:42.980416247 +0100
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@@ -61,7 +61,7 @@
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 	return checksum(data, size);
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 #else
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 	Py_ssize_t size = 0;
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-	char * data = PyUnicode_AsUTF8AndSize(s.ptr(), &size);
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+	const char * data = PyUnicode_AsUTF8AndSize(s.ptr(), &size);
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 	return checksum(data, size);
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 #endif
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 }