Update dependency install script

Signed-off-by: Bili Dong <qobilidop@gmail.com>

build_tools/ubuntu_install_mlir_requirements.sh

@@ -1,22 +1,32 @@
 #!/usr/bin/env bash
-#
-# Reference:
-# - https://mlir.llvm.org/getting_started/
-# - https://llvm.org/docs/GettingStarted.html#requirements
-
 set -ex
 
+# Install common build tools
 sudo apt-get update
 sudo apt-get install -y \
     build-essential \
     ccache \
     clang \
     lld \
     ninja-build \
+    pkg-config \
     python-is-python3 \
     python3 \
-    python3-pip \
-    zlib1g-dev
-
+    python3-pip
 pip install --upgrade \
     cmake
+
+# Install additional LLVM & MLIR dependencies
+# https://llvm.org/docs/GettingStarted.html#requirements
+# https://mlir.llvm.org/getting_started/
+sudo apt-get install -y \
+    zlib1g-dev
+
+# Install additional P4C dependencies
+# https://github.com/p4lang/p4c/blob/main/README.md#ubuntu-dependencies
+sudo apt-get install -y \
+    bison \
+    flex \
+    libboost-dev \
+    libboost-iostreams-dev \
+    libfl-dev