Fails to build on Linux with missing librt

[alansill]

Starting from a fresh git clone of the repository on Centos 8 Linux using either the default gcc 8.3.1 or a newer gcc 10.2.0, I encounter the same error trying to build anything:

/usr/bin/ld: cannot find -lrt
collect2: error: ld returned 1 exit status

    "g++"    -o "/home/(my userid)/pwiz/build-linux-x86_64/ext/hdf5/gcc-10/release/link-static/runtime-link-static/threading-multi/H5make_libsettings" -Wl,--start-group "/home/asill/pwiz/build-linux-x86_64/ext/hdf5/gcc-10/release/link-static/threading-multi/H5make_libsettings.o"     -lrt -Wl,--end-group -pthread -static -fPIC -fno-pie -no-pie

...failed gcc.link /home/(my userid)/pwiz/build-linux-x86_64/ext/hdf5/gcc-10/release/link-static/runtime-link-static/threading-multi/H5make_libsettings...

Note librt is available on our system. Is this a version problem? How can I work around this?

-rwxr-xr-x 1 root root 142608 Feb  4  2020 /usr/lib64/librt-2.28.so
lrwxrwxrwx 1 root root     22 Feb  4  2020 /usr/lib64/librt.so -> ../../lib64/librt.so.1
lrwxrwxrwx 1 root root     13 Feb  4  2020 /usr/lib64/librt.so.1 -> librt-2.28.so

[chambm]

It may want to link statically, so maybe yum install glibc-static ?

[alansill]

After exploring several alternatives, we decided to add glibc-static to the login and worker nodes of our cluster as the simplest alternative. Note that static linking is often discouraged these days, see https://best.openssf.org/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C++.html#when-not-to-use-5 but it seems the best approach in this case. Thanks for the suggestion.