https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78206
--- Comment #1 from Jack Howarth <howarth.at.gcc at gmail dot com> --- Executing the failing configure test with the stage1 xgcc compiler appears as follows... # sandbox-exec -f /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/x86_64-apple-darwin15.6.0/libgcc/fink.sb /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/xgcc -B/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/ -B/sw/lib/gcc5/x86_64-apple-darwin15.6.0/bin/ -B/sw/lib/gcc5/x86_64q-darwin15.6.0/lib/ -isystem /sw/lib/gcc5/x86_64-apple-darwin15.6.0/include -isystem /sw/lib/gcc5/x86_64-apple-darwin15.6.0/sys-include -c -g -O2 conftest.c -v --save-temps Reading specs from /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/specs COLLECT_GCC=/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/xgcc Target: x86_64-apple-darwin15.6.0 Configured with: ../gcc-5.4.0/configure --prefix=/sw --prefix=/sw/lib/gcc5 --mandir=/sw/share/man --infodir=/sw/lib/gcc5/info --enable-languages=c,c++,fortran,lto,objc,obj-c++,java --with-gmp=/sw --with-libiconv-prefix=/sw --with-isl=/sw --with-mpc=/sw --with-system-zlib --with-local-prefix=/usr/local --program-suffix=-fsf-5 Thread model: posix gcc version 5.4.0 (GCC) COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.11.6' '-B' '/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/' '-B' '/sw/lib/gcc5/x86_64-apple-darwin15.6.0/bin/' '-B' '/sw/lib/gcc5/x86_64q-darwin15.6.0/lib/' '-isystem' '/sw/lib/gcc5/x86_64-apple-darwin15.6.0/include' '-isystem' '/sw/lib/gcc5/x86_64-apple-darwin15.6.0/sys-include' '-c' '-g' '-O2' '-v' '-save-temps' '-mtune=core2' /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/cc1 -E -quiet -v -iprefix /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/ -isystem /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/include -isystem /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/include-fixed -D__DYNAMIC__ -isystem /sw/lib/gcc5/x86_64-apple-darwin15.6.0/include -isystem /sw/lib/gcc5/x86_64-apple-darwin15.6.0/sys-include conftest.c -fPIC -feliminate-unused-debug-symbols -mmacosx-version-min=10.11.6 -mtune=core2 -g -fworking-directory -O2 -fpch-preprocess -o conftest.i ignoring nonexistent directory "/sw/lib/gcc5/x86_64-apple-darwin15.6.0/include" ignoring nonexistent directory "/sw/lib/gcc5/x86_64-apple-darwin15.6.0/sys-include" ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/include" ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/include-fixed" ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/../../../../x86_64-apple-darwin15.6.0/include" ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/../../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/include" cc1: error: /usr/local/include: Operation not permitted ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/../../include" ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/../../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/include-fixed" ignoring nonexistent directory "/sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/gcc/../lib/gcc/../../lib/gcc/x86_64-apple-darwin15.6.0/5.4.0/../../../../x86_64-apple-darwin15.6.0/include" #include "..." search starts here: #include <...> search starts here: /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/include /sw/src/fink.build/gcc5-5.4.0-3/darwin_objdir/./gcc/include-fixed /usr/include /System/Library/Frameworks /Library/Frameworks End of search list.