Added boost as an optional dependency
An optional dependency if using the SystemC implementation.
diff --git a/_pages/documentation/learning_gem5/part1/building.md b/_pages/documentation/learning_gem5/part1/building.md
index 1ddbbc8..df8ad35 100644
--- a/_pages/documentation/learning_gem5/part1/building.md
+++ b/_pages/documentation/learning_gem5/part1/building.md
@@ -80,6 +80,14 @@
sudo apt install libprotobuf-dev python-protobuf protobuf-compiler libgoogle-perftools-dev
```
+6. [Boost](https://www.boost.org/) (**Optional**) : The Boost library is a set
+ of general purpose C++ libraries. It is a necessary dependency if you
+ wish to use the SystemC implementation.
+
+ ```
+ sudo apt install libboost-all-dev
+ ```
+
Getting the code
----------------
