Add fatal error if res is not found.

Makefile

@@ -103,8 +103,6 @@ ifdef ARCH_LIN
 	# Manually check that no nonstandard shared libraries are linked
 	ldd dist/Rack/$(TARGET)
 	cp plugins/Fundamental/dist/*.zip dist/Rack/Fundamental.zip
-	mkdir -p dist/Rack/Bridge
-	# cp Bridge/VST/dist/VCV-Bridge{,-fx}.so dist/Rack/Bridge/
 	# Make ZIP
 	cd dist && zip -5 -r Rack-$(VERSION)-$(ARCH).zip Rack
 endif
@@ -123,9 +121,6 @@ ifdef ARCH_MAC
 	otool -L dist/$(TARGET).app/Contents/MacOS/$(TARGET)
 
 	cp plugins/Fundamental/dist/*.zip dist/$(TARGET).app/Contents/Resources/Fundamental.zip
-	# cp -R Bridge/AU/dist/VCV-Bridge.component dist/
-	# cp -R Bridge/VST/dist/VCV-Bridge.vst dist/
-	# cp -R Bridge/VST/dist/VCV-Bridge-fx.vst dist/
 	# Make ZIP
 	cd dist && zip -5 -r Rack-$(VERSION)-$(ARCH).zip $(TARGET).app
 endif
@@ -138,8 +133,6 @@ ifdef ARCH_WIN
 	cp /mingw64/bin/libstdc++-6.dll dist/Rack/
 	cp /mingw64/bin/libgcc_s_seh-1.dll dist/Rack/
 	cp plugins/Fundamental/dist/*.zip dist/Rack/Fundamental.zip
-	# mkdir -p dist/Rack/Bridge
-	# cp Bridge/VST/dist/VCV-Bridge-{32,64,fx-32,fx-64}.dll dist/Rack/Bridge/
 	# Make ZIP
 	cd dist && zip -5 -r Rack-$(VERSION)-$(ARCH).zip Rack
 	# Make NSIS installer

src/main.cpp

@@ -105,6 +105,13 @@ int main(int argc, char *argv[]) {
 	INFO("System directory: %s", asset::systemDir.c_str());
 	INFO("User directory: %s", asset::userDir.c_str());
 
+	std::string resDir = asset::system("res");
+	if (!system::isDirectory(resDir)) {
+		std::string message = string::f("Rack's resource directory \"%s\" does not exist. Make sure Rack is correctly installed and launched.", resDir.c_str());
+		osdialog_message(OSDIALOG_ERROR, OSDIALOG_OK, message.c_str());
+		exit(1);
+	}
+
 	INFO("Initializing environment");
 	random::init();
 	midi::init();