diff --git a/CMakeLists.txt b/CMakeLists.txt
index c8d4133..7e03f6f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,8 +12,8 @@ if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
                PROPERTY VALUE "${CMAKE_BINARY_DIR}/install")
 endif()
 
-find_package(Ruby 3.4.8 EXACT REQUIRED)
-find_package(Python3 3.12 EXACT REQUIRED COMPONENTS Interpreter)
+find_package(Ruby 3.4.8 REQUIRED)
+find_package(Python3 3.12 REQUIRED COMPONENTS Interpreter)
 message("Python found: ${Python3_EXECUTABLE}")
 
 include(ExternalProject)
diff --git a/Gemfile b/Gemfile
index 36f1616..be1058f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 source "https://rubygems.org"
 
-ruby "3.4.8"
+ruby ">= 3.4.8"
 
 gem 'minitest', '~> 5.14'
 gem 'rspec', '~> 3.12'
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 4d58ff4..e7af9be 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -1,10 +1,29 @@
 project(protea_irgen)
 
+set(NATIVE_IR_FILE ${CMAKE_CURRENT_BINARY_DIR}/IR.yaml)
+
 add_custom_command(
-  OUTPUT ${PROJECT_BINARY_DIR}/IR.yaml
+  OUTPUT ${NATIVE_IR_FILE}
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/ir_gen.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/ADL/base.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/ADL/builder.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/ADL/scope.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/ADL/var.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/ADL/value.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/Utility/type.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/Target/RISC-V/encoding.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/Target/RISC-V/32I.rb
+          ${CMAKE_CURRENT_SOURCE_DIR}/Target/RISC-V/32M.rb
   COMMAND ${BUNDLE_PATH} exec ruby ${CMAKE_CURRENT_SOURCE_DIR}/ir_gen.rb
-  COMMENT "Running ${PROJECT_NAME}"
+          --target ${CMAKE_CURRENT_SOURCE_DIR}/Target/RISC-V
+          --output ${NATIVE_IR_FILE}
+  COMMENT "Generating native IR (IR.yaml)"
 )
-add_custom_target(${PROJECT_NAME} DEPENDS ${PROJECT_BINARY_DIR}/IR.yaml)
-install(FILES ${PROJECT_BINARY_DIR}/IR.yaml DESTINATION share/)
+
+add_custom_target(native_gen DEPENDS ${NATIVE_IR_FILE})
+
+add_custom_target(protea_irgen DEPENDS native_gen)
+
+set(NATIVE_IR_FILE ${NATIVE_IR_FILE} PARENT_SCOPE)
+
+install(FILES ${NATIVE_IR_FILE} DESTINATION share/)
diff --git a/lib/ir_gen.rb b/lib/ir_gen.rb
index 1a66c17..e1f911e 100644
--- a/lib/ir_gen.rb
+++ b/lib/ir_gen.rb
@@ -1,10 +1,25 @@
 #!/usr/bin/ruby
 # frozen_string_literal: true
 
+require 'optparse'
+
 require 'ADL/base'
 require 'ADL/builder'
-require 'Target/RISC-V/32I'
-require 'Target/RISC-V/32M'
 
-yaml_data = SimInfra.serialize
-File.write('IR.yaml', yaml_data)
+options = { output: 'IR.yaml', target: nil }
+OptionParser.new do |opts|
+  opts.banner = 'Usage: ir_gen.rb --target DIR --output FILE'
+  opts.on('-t', '--target PATH', 'Target directory or file to load') { |v| options[:target] = v }
+  opts.on('-o', '--output PATH', 'Output file (default: IR.yaml)') { |v| options[:output] = v }
+end.parse!
+
+abort 'error: --target is required' if options[:target].nil?
+
+paths = if File.directory?(options[:target])
+          Dir[File.join(options[:target], '*.rb')].sort
+        else
+          [options[:target]]
+        end
+paths.each { |path| require File.expand_path(path) }
+
+File.write(options[:output], SimInfra.serialize)