Install libgmpxx4ldbl by entering the following commands in the terminal:
sudo apt update sudo apt install libgmpxx4ldbl
Description:
Multiprecision arithmetic library (C++ bindings)
GNU MP is a programmer's library for arbitrary precision arithmetic (ie, a bignum package). It can operate on signed integer, rational, and floating point numeric types.
Homepage: http://gmplib.org/
Version: 2:6.1.2+dfsg-2
Section: libs