/usr/include/InsightToolkit/Utilities/metaIOConfig.h is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// To install MetaIO in ITK, this file should be copied into the directory
// /ITK/Utilities and renamed to metaIOConfig.h
//
// This file is automatically included by
// MetaIO/localMetaConfiguration.h
//
// This file is needed to configure the local MetaIO files at compile time.
// Local MetaIO configuration changes include enabling/disabling the use
// of a MetaIO namespace, format of stl and cout calls, etc. These
// configuration changes differentiate ITK's MetaIO distribution from
// VTK's MetaIO distribution and allow them to share the same code base,
// i.e., the same MetaIO cvs repository is linked into both projects' cvs
// repository. The common MetaIO cvs tree is located in KWPublic/MetaIO/src.
//
#undef METAIO_FOR_VTK
#define METAIO_FOR_ITK 1
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