Hi! I am using at moment on Linux (6.9.3) gcc version 13.3.0 glibc 2.39 binutils 2.42 Here is config what builds: Configured with: ../configure --enable-languages=c,c++,,fortran,lto --prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libdir=/usr/lib64 --includedir=/usr/include --infodir=/usr/info --mandir=/usr/man --sysconfdir=/etc --localstatedir=/var --disable-debug --with-libpam --with-pam --enable-libpam --enable-pam --with-mysql-lib=/opt/mysql/lib64/mysql --with-mysql-include=/opt/mysql/include/mysql --build=x86_64-t2-linux-gnu --host=x86_64-t2-linux-gnu --with-arch=haswell --enable-__cxa_atexit --disable-checking --disable-bootstrap --disable-libstdcxx-pch --disable-libstdc++-v3 --with-zstd --build=x86_64-t2-linux-gnu --target=x86_64-t2-linux-gnu --host=x86_64-t2-linux-gnu --program-suffix=-11 --enable-shared --enable-threads=posix --with-isl --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror --enable-version-specific-runtime-libs --enable-plugin --enable-install-libiberty --datadir=/usr/share/gcc11 --with-gxx-include-dir=/usr/include/c++/11.1.0 I upgraded to latest 11.5.0 GCC version to try build it as it was released recently but i still fail and Google nor Bing wont help and AI is too stupid to be any helpful so i am now lost and asking the great mailing list. The problem itself >> IF i remove " --disable-libstdc++-v3 " as i would wish i hit this next error (cut as its mostly just same error and warning/note) If someone suggests some like LD_PRELOAD ' ' "/usr/lib64/libstdc++.so" I tried yes too. ../../../../libstdc++-v3/src/c++98/compatibility.cc:392:4: error: 'void {anonymous}::_Y_ZNSt13basic_istreamIwSt11char_traitsIwEE6ignoreEi(...)' aliased to undefined symbol '_ZNSt13basic_istreamIwSt11char_traitsIwEE8ignoreXXEi' 392 | _Y##name(...) \ | ^~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:403:31: note: in expansion of macro '_GLIBCXX_3_4_5_SYMVER' 403 | #define _GLIBCXX_APPLY_SYMVER _GLIBCXX_3_4_5_SYMVER | ^~~~~~~~~~~~~~~~~~~~~ /root/t2trunk/src.gcc-11.240722.051008.1422/gcc-11.5.0/objdir/x86_64-t2-linux-gnu/libstdc++-v3/include/x86_64-t2-linux-gnu/bits/compatibility.h:196:1: note: in expansion of macro '_GLIBCXX_APPLY_SYMVER' 196 | _GLIBCXX_APPLY_SYMVER(_ZNSt13basic_istreamIwSt11char_traitsIwEE8ignoreXXEi, | ^~~~~~~~~~~~~~~~~~~~~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:392:4: error: 'void {anonymous}::_Y_ZNSbIwSt11char_traitsIwESaIwEE4_Rep26_M_set_length_and_sharableEj(...)' aliased to undefined symbol '_ZNSbIwSt11char_traitsIwESaIwEE4_Rep28_M_set_length_and_sharableXXEj' 392 | _Y##name(...) \ | ^~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:403:31: note: in expansion of macro '_GLIBCXX_3_4_5_SYMVER' 403 | #define _GLIBCXX_APPLY_SYMVER _GLIBCXX_3_4_5_SYMVER | ^~~~~~~~~~~~~~~~~~~~~ /root/t2trunk/src.gcc-11.240722.051008.1422/gcc-11.5.0/objdir/x86_64-t2-linux-gnu/libstdc++-v3/include/x86_64-t2-linux-gnu/bits/compatibility.h:185:1: note: in expansion of macro '_GLIBCXX_APPLY_SYMVER' 185 | _GLIBCXX_APPLY_SYMVER(_ZNSbIwSt11char_traitsIwESaIwEE4_Rep28_M_set_length_and_sharableXXEj, | ^~~~~~~~~~~~~~~~~~~~~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:392:4: error: 'void {anonymous}::_Y_ZNKSbIwSt11char_traitsIwESaIwEE15_M_check_lengthEjjPKc(...)' aliased to undefined symbol '_ZNKSbIwSt11char_traitsIwESaIwEE17_M_check_lengthXXEjjPKc' 392 | _Y##name(...) \ | ^~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:403:31: note: in expansion of macro '_GLIBCXX_3_4_5_SYMVER' 403 | #define _GLIBCXX_APPLY_SYMVER _GLIBCXX_3_4_5_SYMVER | ^~~~~~~~~~~~~~~~~~~~~ /root/t2trunk/src.gcc-11.240722.051008.1422/gcc-11.5.0/objdir/x86_64-t2-linux-gnu/libstdc++-v3/include/x86_64-t2-linux-gnu/bits/compatibility.h:177:1: note: in expansion of macro '_GLIBCXX_APPLY_SYMVER' 177 | _GLIBCXX_APPLY_SYMVER(_ZNKSbIwSt11char_traitsIwESaIwEE17_M_check_lengthXXEjjPKc, | ^~~~~~~~~~~~~~~~~~~~~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:392:4: error: 'void {anonymous}::_Y_ZNSbIwSt11char_traitsIwESaIwEE9_M_assignEPwjw(...)' aliased to undefined symbol '_ZNSbIwSt11char_traitsIwESaIwEE11_M_assignXXEPwjw' 392 | _Y##name(...) \ | ^~ ../../../../libstdc++-v3/src/c++98/compatibility.cc:403:31: note: in expansion of macro '_GLIBCXX_3_4_5_SYMVER' QUESTION: Why this happends or what i should do? Thanks and best wishes! Aleksi Venäläinen