Support for CGAL 5 (header only)

Hello,

I'm building graph-tool for Fedora (F32/rawhide to begin with). This now contains CGAL5 which is header-only. As a result there are no more libcgal*so files and so, I think the configure script for 2.29 cannot find it.

checking for __gmpz_init in -lgmp... (cached) yes
checking whether CGAL is available in /usr... no
checking whether CGAL is available in /usr/local... no
checking whether CGAL is available in /opt... no
checking whether CGAL is available in /opt/local... no
configure: error: CGAL library not found.

How should this be handled please?