Just a warning, not an error.
/home/jayk/obj/gcc451/alphaev67-dec-osf5.1/libstdc++-v3/include/ext/concurrence.h: In constructor '__gnu_cxx::__cond::__cond()': /home/jayk/obj/gcc451/alphaev67-dec-osf5.1/libstdc++-v3/include/ext/concurrence.h:276:29: warning: missing initializer for member '__pthread_cond_t::__block' bash-4.1$ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/home/jayk/libexec/gcc/alphaev67-dec-osf5.1/4.5.0/lto-wrapper Target: alphaev67-dec-osf5.1 Configured with: /home/jayk/src/gcc-4.5.0/configure -disable-nls -prefix=/home/jayk Thread model: posix gcc version 4.5.0 (GCC) bash-4.1$ uname -a OSF1 hostname V5.1 732 alpha alpha Tru64 -- Summary: concurrence.h: In constructor '__gnu_cxx::__cond::__cond()': /home/jayk/obj/gcc451/alphaev67-dec-osf5.1/libstdc++- v3/include/ext/concurrence.h:276:29: warning: missing initializer for member '__pthread_cond_t::__bloc Product: gcc Version: 4.5.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: jay dot krell at cornell dot edu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45347