docs: Bump minimums to Ubuntu 16.04 and gcc 5.4.0
Change-Id: I140285b365009fff19b26e7d1a3ac2ff3e387f67
diff --git a/BUILD.md b/BUILD.md
index 026298a..5fc7075 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -391,8 +391,8 @@
### Linux Development Environment Requirements
This repository has been built and tested on the two most recent Ubuntu LTS
-versions. Currently, the oldest supported version is Ubuntu 14.04, meaning
-that the minimum supported compiler versions are GCC 4.8.2 and Clang 3.4,
+versions. Currently, the oldest supported version is Ubuntu 16.04, meaning
+that the minimum officially supported C++11 compiler version is GCC 5.4.0,
although earlier versions may work. It should be straightforward to adapt this
repository to other Linux distributions.
