+https://bugs.freedesktop.org/show_bug.cgi?id=101832
+
+--- mesa-17.2.0-rc5/src/gallium/drivers/swr/rasterizer/core/utils.h.omv~ 2017-08-31 00:39:53.063561929 +0200
++++ mesa-17.2.0-rc5/src/gallium/drivers/swr/rasterizer/core/utils.h 2017-08-31 00:40:13.853833494 +0200
+@@ -347,7 +347,8 @@ static INLINE std::string GetEnv(const s
+ output.resize(valueSize - 1); // valueSize includes null, output.resize() does not
+ GetEnvironmentVariableA(variableName.c_str(), &output[0], valueSize);
+ #else
+- output = getenv(variableName.c_str());
++ char *o = getenv(variableName.c_str());
++ output = o ? std::string(o) : std::string();
+ #endif
+
+ return output;