On a recent CURRENT (FreeBSD 12.0-CURRENT #38 r328211: Sun Jan 21 08:48:56 CET 2018 amd64, CLANG 6.0.0, WITH_LLD_IS_LD) with poudriere (jail has same revision as host), the port x11-toolkits/wxgtk28-common dies configuring in poudriere with the error as follows. [...] checking if expat.h is valid C++ header... no configure: error: system expat library not found! Use --with-expat=builtin to use built-in version ===> Script "configure" failed unexpectedly. Please report the problem to fjoe@FreeBSD.org [maintainer] and attach the "/wrkdirs/usr/ports/x11-toolkits/wxgtk28-common/work/wxGTK-2.8.12/config.log" including the output of the failure of your make command. Also, it might be a good idea to provide an overview of all packages installed on your system (e.g. a /usr/local/sbin/pkg-static info -g -Ea). *** Error code 1 Stop. make: stopped in /usr/ports/x11-toolkits/wxgtk28-common
*** This bug has been marked as a duplicate of bug 225421 ***