Hi, I'm trying to compile my application that links to CLN using the clang compiler, and it is complaining (warning) about struct/class mixups: In file included from /opt/local/include/cln/cln.h:27: /opt/local/include/cln/string.h:28:9: warning: class 'cl_string' was previously declared as a struct [-Wmismatched-tags] friend class cl_string; ^ /opt/local/include/cln/string.h:13:8: note: previous use is here struct cl_string; ^ In file included from /Users/spoel/GG/alexandria/gromacs/src/gromacs/coulombintegrals/DSlater_1S_3S.cpp:1: In file included from /Users/spoel/GG/alexandria/gromacs/src/gromacs/coulombintegrals/slater_low.h:46: In file included from /opt/local/include/cln/cln.h:29: /opt/local/include/cln/proplist.h:41:1: warning: 'cl_property_list' defined as a struct here but previously declared as a class [-Wmismatched-tags] struct cl_property_list { ^ /opt/local/include/cln/proplist.h:35:9: note: did you mean struct here? friend class cl_property_list; ^~~~~ struct 2 warnings generated. Clues? -- David van der Spoel, Ph.D., Professor of Biology Dept. of Cell & Molec. Biol., Uppsala University. Box 596, 75124 Uppsala, Sweden. Phone: +46184714205. spoel@xray.bmc.uu.se http://folding.bmc.uu.se