--- Portfile.orig	2015-12-18 15:43:41.000000000 +0100
+++ Portfile	2015-12-18 17:05:08.000000000 +0100
@@ -97,13 +97,15 @@
 
 use_configure   no
 
+configure.cxxflags   -Wno-potentially-evaluated-expression
+
 build {
     set jobsargs ""
     if {${build.jobs} > 1} {
         set jobsargs " -j${build.jobs}"
     }
 
-    set cmd "cd ${build.dir} && make${jobsargs} prefix='${prefix}' embedded_runpath_prefix='${prefix}' CC='${configure.cc}' CXX='${configure.cxx}' OPTIMIZE='yes' BZIP2_HOME='${prefix}' DB_HOME='${prefix}' EXPAT_HOME='${prefix}' OPENSSL_HOME='${prefix}' READLINE_HOME='${prefix}' USE_READLINE=yes MCPP_HOME='${prefix}' all && cd doc && make${jobsargs}"
+    set cmd "cd ${build.dir} && make${jobsargs} prefix='${prefix}' embedded_runpath_prefix='${prefix}' CC='${configure.cc}' CXX='${configure.cxx}' CXXFLAGS='${configure.cxxflags}' OPTIMIZE='yes' BZIP2_HOME='${prefix}' DB_HOME='${prefix}' EXPAT_HOME='${prefix}' OPENSSL_HOME='${prefix}' READLINE_HOME='${prefix}' USE_READLINE=yes MCPP_HOME='${prefix}' all && cd doc && make${jobsargs}"
     ui_debug ${cmd}
     system ${cmd}
 }