diff --git a/meson.build b/meson.build
index 43145c8..d6ad9fe 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('4DSSE', 'cpp', version: '0.0.1a', default_options: ['cpp_std=c++23'])
+project('4DSSE', 'cpp', version: '0.0.1a', default_options: ['cpp_std=c++23'], meson_version: '>=1.6.0')
 
 # Add default visibility for all C++ targets
 add_project_arguments('-fvisibility=default', language: 'cpp')
diff --git a/meson_options.txt b/meson_options.txt
index b9f2fff..c3b5afd 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1 +1 @@
-option('build_tests', type: 'boolean', value: true, description: 'Build tests')
\ No newline at end of file
+option('build_tests', type: 'boolean', value: true, description: 'Build tests')
diff --git a/src/meson.build b/src/meson.build
index 4acff3e..db87771 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -3,4 +3,5 @@ subdir('resources')
 
 # Build the main source code
 subdir('dobj')
-subdir('const')
\ No newline at end of file
+subdir('const')
+subdir('opatIO')
\ No newline at end of file