<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="VcsDirectoryMappings">
    <mapping directory="" vcs="Git"/>
  </component>
</project>

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="VcsDirectoryMappings">
    <mapping directory="" vcs="Git"/>
    <mapping directory="$PROJECT_DIR$/make-includes" vcs="Git"/>
  </component>
</project>

Include make-includes subproject root in IDEA
Include make-includes subproject root in IDEA
