1. this only makes interfacing with C++ libraries safe, not with C or the C-ish subset of C++. So no C pointers without unsafe. 2. many C/C++ library bindings

1. this only makes interfacing with C++ libraries safe, not with C or the C-ish subset of C++. So no C pointers without unsafe. 2. many C/C++ library bindings in Rust ship the C code with them, so no need to install the library, only the compiler.