I think you should also adapt tests/Makefile.am to use our own elf.h in this case. See https://codereview.qt-project.org/#/c/187812/25 for my solution to this.
- [PATCH] configure: Add new --enable-install-elfh option. Mark Wielaard
- Re: [PATCH] configure: Add new --enable-install-elfh op... Ulf Hermann
- Re: [PATCH] configure: Add new --enable-install-elf... Mark Wielaard
- Re: [PATCH] configure: Add new --enable-install... Mark Wielaard
- Re: [PATCH] configure: Add new --enable-install... Ulf Hermann
- Re: [PATCH] configure: Add new --enable-ins... Mark Wielaard