libgmp-dev - 2:6.2.1+dfsg-1+deb11u1 main

This development package provides the header files and the symbolic
links to allow compilation and linking of programs that use the libraries
provided in the libgmp10 package.
.
Both C and C++ bindings are present in this package. Package
libstdc++-dev is required to use the C++ bindings.
.
The MPFR library (multiple-precision floating-point) used to be
included, but has since been moved to package libmpfr-dev.