/usr/include/ept/ is in libept-dev 1.0.6~exp1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ept/apt/
/usr/include/ept/apt/apt.h
/usr/include/ept/apt/apt.test.h
/usr/include/ept/apt/packagerecord.h
/usr/include/ept/apt/packagerecord.test.h
/usr/include/ept/apt/recordparser.h
/usr/include/ept/apt/recordparser.test.h
/usr/include/ept/apt/version.h
/usr/include/ept/apt/version.test.h
/usr/include/ept/axi/
/usr/include/ept/axi/axi.h
/usr/include/ept/axi/axi.test.h
/usr/include/ept/debtags/
/usr/include/ept/debtags/debtags.h
/usr/include/ept/debtags/debtags.tcc
/usr/include/ept/debtags/debtags.test.h
/usr/include/ept/debtags/expression.test.h
/usr/include/ept/debtags/maint/
/usr/include/ept/debtags/maint/debdbparser.h
/usr/include/ept/debtags/maint/path.h
/usr/include/ept/debtags/maint/sourcedir.h
/usr/include/ept/debtags/maint/sourcedir.tcc
/usr/include/ept/debtags/utils.h
/usr/include/ept/debtags/vocabulary.h
/usr/include/ept/debtags/vocabulary.test.h
/usr/include/ept/intro.doc.h
/usr/include/ept/popcon/
/usr/include/ept/popcon/local.h
/usr/include/ept/popcon/local.test.h
/usr/include/ept/popcon/maint/
/usr/include/ept/popcon/maint/path.h
/usr/include/ept/popcon/maint/popconindexer.h
/usr/include/ept/popcon/maint/sourcedir.h
/usr/include/ept/popcon/popcon.h
/usr/include/ept/popcon/popcon.test.h
/usr/include/ept/progresscallback.h
/usr/include/ept/sources.h
/usr/include/ept/test-main.h
/usr/include/ept/test-runner.h
/usr/include/ept/test.h
/usr/include/ept/token.h