libgmpxx4ldbl software package provides Multiprecision arithmetic library (C++ bindings), you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgmpxx4ldbl
libgmpxx4ldbl is installed in your system.
Make ensure the libgmpxx4ldbl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgmpxx4ldbl *
You will get with libgmpxx4ldbl package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Libraries |
| Package | libgmpxx4ldbl |
| Version | 2:5.1.3+dfsg-1ubuntu1 |
| Description | Multiprecision arithmetic library (C++ bindings) |
| Sub Section | libs |