I've been struggling to get graph-tool installed on a standard 18.04 Ubuntu system for the past few hours (~5) due to the CGAL dependency. I first tried installing graph-tool from the packages, which ran fine but the library didn't actually seem to get installed (all the python import statements couldn't find it). I then tried installing from source and it makes it all the way to the end with the error: 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 However, libcgal-dev is definitely installed: dpkg -L libcgal-dev | head -n10 /. /usr /usr/lib /usr/lib/x86_64-linux-gnu /usr/lib/x86_64-linux-gnu/cmake /usr/lib/x86_64-linux-gnu/cmake/CGAL /usr/lib/x86_64-linux-gnu/cmake/CGAL/CGAL_Macros.cmake /usr/lib/x86_64-linux-gnu/cmake/CGAL/FindTBB.cmake /usr/lib/x86_64-linux-gnu/cmake/CGAL/CGAL_Common.cmake /usr/lib/x86_64-linux-gnu/cmake/CGAL/CGALExports-release.cmake No amount of futzing about with the LDFLAGS/CFLAGS seems to get it to work. Has anyone run into this before? This is probably the longest time I've spent trying to install a package in years :( -- Sent from: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/