* Andreas Tille <andreas@an3as.eu>, 2015-07-03, 06:10:
CXX unit_tests/bin_test_all-test_main.o In file included from ./unit_tests/gtest/gtest.h:308:0, from unit_tests/test_main.cc:20: /usr/include/c++/5/sstream:335:7: error: 'struct std::basic_stringbuf<_CharT, _Traits, _Alloc>::__xfer_bufptrs' redeclared with different access struct __xfer_bufptrs ^ make[3]: *** [unit_tests/bin_test_all-test_main.o] Error 1
Unfortunately, the build system hides compiler flags, and they are crucial for understanding what happened here.
Apparently tests are compiled with "private" redefined as "public": bin_test_all_CPPFLAGS = -Dprotected=public -Dprivate=public -DJSON_IS_AMALGAMATION=1 This breaks the <sstream> header: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65899 -- Jakub Wilk