A sane build system + package management solution for C++. I have to cobble it together via CMake + Conan every time and I'm praying I get put on a new Rust project someday, but my position and sizeable comp are mainly for being a "legacy janitor".
Trivial example: libfftw3 has --enable-threads and --enable-float configure/compile time options. Your project may need/want both, one or neither of these options (it may, in fact, want two different versions of the library).
Rust "proposes" to deal with this by essentially compiling its libraries as a part of building your project (ie. "vendoring" every 3rd party library dependency).
Most C++ developers don't consider vendoring in this way to be particularly sane, even though many of us do it anyway.
Crabs in a bucket.
Bazel is a tool by and for Google scale companies, which 99% of tech companies aren't. Make and co are good enough for most use cases.