diff --git a/viewer-egui/Cargo.toml b/viewer-egui/Cargo.toml
deleted file mode 100644
index 14360bf..0000000
--- a/viewer-egui/Cargo.toml
+++ /dev/null
@@ -1,15 +0,0 @@
-[package]
-name = "viewer-egui"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-stc-rs = { path = "../lib", features = ["lalrpop_parser"] }
-pretty_env_logger = "*"
-log = "*"
-once_cell = "*"
-async-channel = "*"
-quick-xml = { version = "*", features = ["serialize"] }
-serde = { version = "*", features = ["derive"] }
-eframe = { version = "*", features = ["default"] }
-egui_extras = { version = "*", features = ["default", "image"] }
\ No newline at end of file
diff --git a/viewer/src/bin.rs b/viewer/src/bin.rs
new file mode 100644
index 0000000..7a649cd
--- /dev/null
+++ b/viewer/src/bin.rs
@@ -0,0 +1,26 @@
+mod storage;
+
+#[cfg(feature = "gui-egui")]
+mod egui;
+
+#[cfg(feature = "gui-gtk4")]
+mod column_object;
+#[cfg(feature = "gui-gtk4")]
+mod gtk4;
+#[cfg(feature = "gui-gtk4")]
+mod stc_viewer;
+
+#[cfg(all(feature = "gui-egui", feature = "gui-gtk4"))]
+compile_error!(
+    "Feature gui-egui and gui-gtk4 are mutually exclusive and cannot be enabled together"
+);
+
+#[cfg(feature = "gui-gtk4")]
+fn main() {
+    gtk4::main()
+}
+
+#[cfg(feature = "gui-egui")]
+fn main() -> Result<(), eframe::Error> {
+    egui::main()
+}
diff --git a/viewer-egui/src/main.rs b/viewer/src/egui.rs
similarity index 97%
rename from viewer-egui/src/main.rs
rename to viewer/src/egui.rs
index 7cf6ab1..1d7b0e9 100644
--- a/viewer-egui/src/main.rs
+++ b/viewer/src/egui.rs
@@ -44,7 +44,7 @@ impl eframe::App for StcViewer {
     }
 }
 
-fn main() -> Result<(), eframe::Error> {
+pub fn main() -> Result<(), eframe::Error> {
     pretty_env_logger::init();
 
     let options = eframe::NativeOptions {
diff --git a/viewer/src/main.rs b/viewer/src/gtk4.rs
similarity index 98%
rename from viewer/src/main.rs
rename to viewer/src/gtk4.rs
index 7eb9e45..6847c96 100644
--- a/viewer/src/main.rs
+++ b/viewer/src/gtk4.rs
@@ -1,8 +1,6 @@
-mod column_object;
-mod stc_viewer;
-mod storage;
-
 use crate::stc_viewer::{StcViewerApp, UIMessages, STC_VIEWER_COLUMN_NAME};
+use crate::storage;
+
 use glib::MainContext;
 use gtk4::gdk::ffi::GDK_BUTTON_SECONDARY;
 use gtk4::gdk::Rectangle;
@@ -16,7 +14,7 @@ use stc::prelude::*;
 use std::rc::Rc;
 use std::sync::Mutex;
 
-fn main() {
+pub fn main() {
     pretty_env_logger::init();
 
     let mgr = UnitsManager::new();