/usr/include/ITK-4.9/expatDllConfig.h is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #ifndef _expatDllConfig_h
#define _expatDllConfig_h
/* #undef ITK_EXPAT_STATIC */
#include "itk_expat_mangle.h"
#endif
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