Cannot build on Ubuntu 20

[delameter]

Hello. Getting this when trying to build the plugin manually. cmake . works, but then:

$ make &> out ; head out
[ 12%] Linking CXX executable tmux-mem-cpu-load
/usr/bin/ld: CMakeFiles/tmux-mem-cpu-load.dir/common/main.cc.o: in function `cpu_string[abi:cxx11](CPU_MODE, unsigned int, unsigned int, bool, bool, bool)':main.cc:(.text+0x70): undefined reference to `std::__cxx11::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream()'
/usr/bin/ld: main.cc:(.text+0x217): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/usr/bin/ld: main.cc:(.text+0x256): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: main.cc:(.text+0x265): undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/usr/bin/ld: main.cc:(.text+0x27b): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/usr/bin/ld: main.cc:(.text+0x2e0): undefined reference to `std::basic_ios<char, std::char_traits<char> >::fill(char)'
/usr/bin/ld: main.cc:(.text+0x2f6): undefined reference to `std::ostream::operator<<(std::ios_base& (*)(std::ios_base&))'

$ gcc -v                                     
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.4.0-1ubuntu1~20.04.1' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-9-Av3uEd/gcc-9-9.4.0/debian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)

[delameter]

$ apt list --installed libstdc*
Listing... Done
libstdc++-9-dev/focal-updates,focal-security,now 9.4.0-1ubuntu1~20.04.1 amd64 [installed,automatic]
libstdc++6/focal-updates,focal-security,now 10.3.0-1ubuntu1~20.04 amd64 [installed]

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[github-actions[bot]]

This issue was closed because it has been stalled for 30 days with no activity.