chore: fix build on linux

src/ModMan.lua

@@ -39,6 +39,11 @@ function ModMan:project()
 		includedirs {
 			"%{prj.location}"
 		}
+
+		filter { "system:linux", "action:gmake" }
+  			buildoptions { "`pkg-config --cflags gtk4 webkitgtk-6.0`" }
+  			linkoptions { "`pkg-config --libs gtk4 webkitgtk-6.0`" }
+		filter {}
 		
 		self:include(includes)
 		webview:include(includes)

src/ModMan/main.cpp

@@ -53,7 +53,9 @@ int main()
             },
             nullptr);
 
+#if defined(WEBVIEW_PLATFORM_WINDOWS) && defined(WEBVIEW_EDGE)
         edge::InstallCustomProtocolHandler(w);
+#endif
 
         w.navigate("http://modman/index.html");
         w.run();