Hi I am trying to install graphtool 2.2.35, I have installed all required library and verified that it is working. However when I run ./configure then I got the following error: checking: : : Using python version: 2.7.5 =========================== checking for boostlib >= 1.53.0... yes checking whether the Boost::Python library is available... yes checking for exit in -lboost_python... yes checking whether the Boost::Iostreams library is available... yes checking for exit in -lboost_iostreams... no checking for exit in -lboost_iostreams... (cached) no checking for exit in -lboost_iostreams-mt... no checking for exit in -lboost_iostreams-mt-py2.5... no checking whether the Boost::Regex library is available... yes checking for exit in -lboost_regex... yes checking whether the Boost::Graph library is available... yes checking for exit in -lboost_graph... yes checking for main in -lCGAL... no checking whether to cgal debbuging with valgrind...... no checking python module: numpy... yes checking for /usr/lib64/python2.7/site-packages/numpy/core/include/numpy/arrayobject.h... yes checking python module: scipy... yes checking /usr/lib64/python2.7/site-packages/scipy/weave/scxx/object.h usability... yes checking /usr/lib64/python2.7/site-packages/scipy/weave/scxx/object.h presence... yes checking for /usr/lib64/python2.7/site-packages/scipy/weave/scxx/object.h... yes checking expat.h usability... yes checking expat.h presence... yes checking for expat.h... yes *checking CGAL/version.h usability... no config.log <http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/file/n4025904/config.log> checking CGAL/version.h presence... no checking for CGAL/version.h... no configure: error: CGAL headers not found* I have attached the config.log file I am using Linux centos 7 GCC 4.8 Boost 1_57_.0 Pyhton 2.7.5 CGAL 3.5 GMP 6 Could you please help me out? I have already spent twoo much time too figure it out bu no luck. your help in this regard would highly be appreciated -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.