headers are installed at the root of /usr/include despite other INSTALL_INCLUDEDIR

  -DCMAKE_INSTALL_PREFIX=/usr \
  -DINSTALL_BINDIR=lib/qt-android-6.4-arm64-v8a/bin \
  -DINSTALL_LIBDIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a \
  -DINSTALL_LIBEXECDIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a/libexec \
  -DINSTALL_ARCHDATADIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a \
  -DINSTALL_EXAMPLESDIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a/examples \
  -DINSTALL_DATADIR=share/qt-android-6.4-arm64-v8a \
  -DINSTALL_DESCRIPTIONSDIR=share/qt-android-6.4-arm64-v8a/modules \
  -DINSTALL_DOCDIR=share/qt-android-6.4-arm64-v8a/doc \
  -DINSTALL_SYSCONFDIR=lib/qt-android-6.4-arm64-v8a/etc/xdg \
  -DINSTALL_INCLUDEDIR=include/x86_64-linux-gnu/qt-android-6.4-arm64-v8a \
  -DINSTALL_PLUGINSDIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a/plugins \
  -DINSTALL_TESTSDIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a/tests \
  -DINSTALL_TRANSLATIONSDIR=share/qt-android-6.4-arm64-v8a/translations \
  -DINSTALL_MKSPECSDIR=lib/x86_64-linux-gnu/qt-android-6.4-arm64-v8a/mkspecs \
  -DINSTALL_PUBLICBINDIR=lib/qt-android-6.4-arm64-v8a/bin \
  -DBUILD_WITH_PCH=OFF \
  -DQT_QMAKE_TARGET_MKSPEC=android-clang \
  -DANDROID_SDK_ROOT=/builds/bastif/qt-android/android-sdk \
  -DCMAKE_TOOLCHAIN_FILE=/builds/bastif/qt-android/r23c/android-ndk-r23c/build/cmake/android.toolchain.cmake \
  -DANDROID_ABI=arm64-v8a \
  -DQT_USE_CCACHE=ON -DQT_HOST_PATH=/usr -DQT_HOST_PATH_CMAKE_DIR=/usr/lib/x86_64-linux-gnu/qt-android-6.4-host/cmake -DCMAKE_BUILD_TYPE=Release \
  -DWARNINGS_ARE_ERRORS=OFF \
  -DBUILD_qtwayland=OFF \
  -DBUILD_qtwebengine=OFF \
  -DFEATURE_clang=ON \
  -DFEATURE_clangcpp=ON \
  -DTEST_libclang=ON \
  -DCMAKE_BUILD_RPATH_USE_ORIGIN=ON

/usr/include/QtFreetypeDepends
/usr/include/QtHarfbuzzDepends
/usr/include/autohint.h
/usr/include/cffotypes.h
/usr/include/cfftypes.h
/usr/include/compiler-macros.h
/usr/include/freetype.h
/usr/include/ft2build.h
/usr/include/ftadvanc.h
/usr/include/ftbbox.h
/usr/include/ftbdf.h
/usr/include/ftbitmap.h
/usr/include/ftbzip2.h
/usr/include/ftcache.h
/usr/include/ftcalc.h
/usr/include/ftchapters.h
/usr/include/ftcid.h
/usr/include/ftcolor.h
/usr/include/ftconfig.h
/usr/include/ftdebug.h
/usr/include/ftdriver.h
/usr/include/ftdrv.h
/usr/include/fterrdef.h
/usr/include/fterrors.h
/usr/include/ftfntfmt.h
/usr/include/ftgasp.h
/usr/include/ftgloadr.h
/usr/include/ftglyph.h
/usr/include/ftgxval.h
/usr/include/ftgzip.h
/usr/include/fthash.h
/usr/include/ftheader.h
/usr/include/ftimage.h
/usr/include/ftincrem.h
/usr/include/ftlcdfil.h
/usr/include/ftlist.h
/usr/include/ftlogging.h
/usr/include/ftlzw.h
/usr/include/ftmac.h
/usr/include/ftmemory.h
/usr/include/ftmm.h
/usr/include/ftmodapi.h
/usr/include/ftmoderr.h
/usr/include/ftmodule.h
/usr/include/ftobjs.h
/usr/include/ftoption.h
/usr/include/ftotval.h
/usr/include/ftoutln.h
/usr/include/ftparams.h
/usr/include/ftpfr.h
/usr/include/ftpsprop.h
/usr/include/ftrender.h
/usr/include/ftrfork.h
/usr/include/ftserv.h
/usr/include/ftsizes.h
/usr/include/ftsnames.h
/usr/include/ftstdlib.h
/usr/include/ftstream.h
/usr/include/ftstroke.h
/usr/include/ftsynth.h
/usr/include/ftsystem.h
/usr/include/fttrace.h
/usr/include/fttrigon.h
/usr/include/fttypes.h
/usr/include/ftvalid.h
/usr/include/ftwinfnt.h
/usr/include/hb-blob.h
/usr/include/hb-buffer.h
/usr/include/hb-common.h
/usr/include/hb-deprecated.h
/usr/include/hb-face.h
/usr/include/hb-font.h
/usr/include/hb-ot-font.h
/usr/include/hb-ot-layout.h
/usr/include/hb-ot-math.h
/usr/include/hb-ot-shape.h
/usr/include/hb-ot-tag.h
/usr/include/hb-ot-var.h
/usr/include/hb-ot.h
/usr/include/hb-set.h
/usr/include/hb-shape-plan.h
/usr/include/hb-shape.h
/usr/include/hb-unicode.h
/usr/include/hb-version.h
/usr/include/hb.h
/usr/include/integer-types.h
/usr/include/mac-support.h
/usr/include/otsvg.h
/usr/include/psaux.h
/usr/include/pshints.h
/usr/include/public-macros.h
/usr/include/sfnt.h
/usr/include/svbdf.h
/usr/include/svcfftl.h
/usr/include/svcid.h
/usr/include/svfntfmt.h
/usr/include/svginterface.h
/usr/include/svgldict.h
/usr/include/svgxval.h
/usr/include/svkern.h
/usr/include/svmetric.h
/usr/include/svmm.h
/usr/include/svotval.h
/usr/include/svpfr.h
/usr/include/svpostnm.h
/usr/include/svprop.h
/usr/include/svpscmap.h
/usr/include/svpsinfo.h
/usr/include/svsfnt.h
/usr/include/svttcmap.h
/usr/include/svtteng.h
/usr/include/svttglyf.h
/usr/include/svwinfnt.h
/usr/include/t1tables.h
/usr/include/t1types.h
/usr/include/ttnameid.h
/usr/include/tttables.h
/usr/include/tttags.h
/usr/include/tttypes.h
/usr/include/wofftypes.h