Update for Ubuntu 21.x build dependencies (#3727)

Add Ubuntu 21.x build dependencies

diff --git a/INSTALL.md b/INSTALL.md
index 8001986dc024558344d4876354c30189c3e8359d..280dd32c9d400f813473103564c864bc0deba644 100644 (file)
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -340,6 +340,9 @@ sudo apt-get -y install bison build-essential cmake flex git libedit-dev \
 # For Eoan (19.10) or Focal (20.04.1 LTS)
 sudo apt install -y bison build-essential cmake flex git libedit-dev \
   libllvm7 llvm-7-dev libclang-7-dev python zlib1g-dev libelf-dev libfl-dev python3-distutils
+  
+# For Hirsute (21.04)  or Impish (21.10)
+sudo apt install -y bison build-essential cmake flex git libedit-dev   libllvm11 llvm-11-dev libclang-11-dev python zlib1g-dev libelf-dev libfl-dev python3-distutils
 
 # For other versions
 sudo apt-get -y install bison build-essential cmake flex git libedit-dev \