Removed boost as a dependency

It is no longer a dependency: https://gem5.atlassian.net/browse/GEM5-6
diff --git a/_pages/documentation/learning_gem5/part1/building.md b/_pages/documentation/learning_gem5/part1/building.md
index 56b91d6..1ddbbc8 100644
--- a/_pages/documentation/learning_gem5/part1/building.md
+++ b/_pages/documentation/learning_gem5/part1/building.md
@@ -23,7 +23,7 @@
 following command. The requirements are detailed below.
 
 ```
-sudo apt install build-essential git m4 scons zlib1g zlib1g-dev libprotobuf-dev protobuf-compiler libprotoc-dev libgoogle-perftools-dev python-dev libboost-all-dev python
+sudo apt install build-essential git m4 scons zlib1g zlib1g-dev libprotobuf-dev protobuf-compiler libprotoc-dev libgoogle-perftools-dev python-dev python
 ```
 
 1.  git ([Git](https://git-scm.com/)):
@@ -80,20 +80,6 @@
         sudo apt install libprotobuf-dev python-protobuf protobuf-compiler libgoogle-perftools-dev
         ```
 
-6. [Boost](https://www.boost.org/)
-    :   The Boost library is a set of general purpose C++ libraries used by Gem5.
-
-        ```
-        sudo apt install libboost-all-dev
-        ```
-
-6. [Boost](https://www.boost.org/)
-    :   The Boost library is a set of general purpose C++ libraries used by Gem5.
-
-        ```
-        sudo apt-get install libboost-all-dev
-        ```
-
 Getting the code
 ----------------