[gmp-6.3.0] [spkg-install] checking build system compiler gcc... yes
[gmp-6.3.0] [spkg-install] checking for build system preprocessor... gcc -E
[gmp-6.3.0] [spkg-install] checking for build system executable suffix... 
[gmp-6.3.0] [spkg-install] checking whether build system compiler is ANSI... yes
[gmp-6.3.0] [spkg-install] checking for build system compiler math library... -lm
[gmp-6.3.0] [spkg-install] checking whether we are using the GNU C++ compiler... yes
[gmp-6.3.0] [spkg-install] checking whether g++ accepts -g... yes
[gmp-6.3.0] [spkg-install] checking C++ compiler g++  -O2 -pedantic -fomit-frame-pointer -m64 -mtune=znver2 -march=znver2... no, std iostream, program does not run
[gmp-6.3.0] [spkg-install] checking C++ compiler g++  -g -O2... no, std iostream, program does not run
[gmp-6.3.0] [spkg-install] configure: error: C++ compiler not available, see config.log for details
[gmp-6.3.0] [spkg-install] Error configuring GMP (with CFLAGS unset).
[gmp-6.3.0] [spkg-install] Consult /var/lib/buildbot/worker/sage_git/build/local/var/tmp/sage/build/gmp-6.3.0/src/config.log for for details.
[gmp-6.3.0] ************************************************************************
[gmp-6.3.0] Error installing package gmp-6.3.0
[gmp-6.3.0] ************************************************************************
[gmp-6.3.0] Please email sage-devel (http://groups.google.com/group/sage-devel)
[gmp-6.3.0] explaining the problem and including the log files
[gmp-6.3.0]   /var/lib/buildbot/worker/sage_git/build/logs/pkgs/gmp-6.3.0.log
[gmp-6.3.0] and
[gmp-6.3.0]   /var/lib/buildbot/worker/sage_git/build/config.log
[gmp-6.3.0] Describe your computer, operating system, etc.
[gmp-6.3.0] If you want to try to fix the problem yourself, *don't* just cd to
[gmp-6.3.0] /var/lib/buildbot/worker/sage_git/build/local/var/tmp/sage/build/gmp-6.3.0 and type 'make' or whatever is appropriate.
[gmp-6.3.0] Instead, the following commands setup all environment variables
[gmp-6.3.0] correctly and load a subshell for you to debug the error:
[gmp-6.3.0]   (cd '/var/lib/buildbot/worker/sage_git/build/local/var/tmp/sage/build/gmp-6.3.0' && '/var/lib/buildbot/worker/sage_git/build/sage' --buildsh)
[gmp-6.3.0] When you are done debugging, you can type "exit" to leave the subshell.
[gmp-6.3.0] ************************************************************************

Test compile: std iostream
configure:10620: g++  -g -O2 conftest.cc >&5
configure:10623: $? = 0
configure:10627: ./a.out || ./b.out || ./a.exe || ./a_out.exe || ./conftest
./a.out: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.32' not found (required by ./a.out)
./configure: line 10628: ./b.out: No such file or directory
./configure: line 10628: ./a.exe: No such file or directory
./configure: line 10628: ./a_out.exe: No such file or directory
./configure: line 10628: ./conftest: No such file or directory
configure:10630: $? = 127