diff --git a/source/backend/plugin/CarlaPluginJack.cpp b/source/backend/plugin/CarlaPluginJack.cpp
index 0b5a68b8b..ad9b8543a 100644
--- a/source/backend/plugin/CarlaPluginJack.cpp
+++ b/source/backend/plugin/CarlaPluginJack.cpp
@@ -142,9 +142,7 @@ public:
 
         CarlaString ret;
         ret += "export LD_LIBRARY_PATH=" + binaryDir + "/jack\n";
-#ifdef HAVE_X11
         ret += "export LD_PRELOAD=" + binaryDir + "/libcarla_interposer-jack-x11.so\n";
-#endif
 #ifdef HAVE_LIBLO
         if (sessionManager == LIBJACK_SESSION_MANAGER_NSM)
         {
@@ -329,14 +327,8 @@ protected:
             std::snprintf(winIdStr, STR_MAX, P_UINTPTR, options.frontendWinId);
             winIdStr[STR_MAX] = '\0';
 
-            CarlaString libjackdir(options.binaryDir);
-            libjackdir += "/jack";
-
-            CarlaString ldpreload;
-#ifdef HAVE_X11
-            ldpreload = (CarlaString(options.binaryDir)
-                    + "/libcarla_interposer-jack-x11.so");
-#endif
+            const CarlaString libjackdir(CarlaString(options.binaryDir) + "/jack");
+            const CarlaString ldpreload(CarlaString(options.binaryDir) + "/libcarla_interposer-jack-x11.so");
 
             const ScopedEngineEnvironmentLocker _seel(kEngine);
 
diff --git a/source/interposer/Makefile b/source/interposer/Makefile
index ae53e1cfe..88eaf2b0b 100644
--- a/source/interposer/Makefile
+++ b/source/interposer/Makefile
@@ -33,13 +33,13 @@ TARGETS =
 
 ifeq ($(LINUX),true)
 OBJS    += $(OBJDIR)/interposer-safe.cpp.o
+OBJS    += $(OBJDIR)/interposer-jack-x11.cpp.o
 TARGETS += $(BINDIR)/libcarla_interposer-safe.so
+TARGETS += $(BINDIR)/libcarla_interposer-jack-x11.so
 
 ifeq ($(HAVE_X11),true)
 OBJS    += $(OBJDIR)/interposer-x11.cpp.o
-OBJS    += $(OBJDIR)/interposer-jack-x11.cpp.o
 TARGETS += $(BINDIR)/libcarla_interposer-x11.so
-TARGETS += $(BINDIR)/libcarla_interposer-jack-x11.so
 endif
 endif
 
diff --git a/source/interposer/interposer-jack-x11.cpp b/source/interposer/interposer-jack-x11.cpp
index d5a06156d..b96ed9c24 100644
--- a/source/interposer/interposer-jack-x11.cpp
+++ b/source/interposer/interposer-jack-x11.cpp
@@ -19,7 +19,10 @@
 #include "CarlaUtils.hpp"
 
 #include <dlfcn.h>
-#include <X11/Xlib.h>
+
+#ifdef HAVE_X11
+# include <X11/Xlib.h>
+#endif
 
 // --------------------------------------------------------------------------------------------------------------------
 
@@ -59,12 +62,6 @@ struct ScopedLibOpen {
     CARLA_DECLARE_NON_COPY_STRUCT(ScopedLibOpen);
 };
 
-// --------------------------------------------------------------------------------------------------------------------
-// Function typedefs
-
-typedef int (*XWindowFunc)(Display*, Window);
-typedef int (*XNextEventFunc)(Display*, XEvent*);
-
 // --------------------------------------------------------------------------------------------------------------------
 // Current state
 
@@ -75,8 +72,10 @@ typedef enum {
     WindowMapSubwindows
 } WindowMappingType;
 
+#ifdef HAVE_X11
 static Display* gCurrentlyMappedDisplay = nullptr;
 static Window gCurrentlyMappedWindow = 0;
+#endif
 static CarlaInterposedCallback gInterposedCallback = nullptr;
 static uint gInterposedSessionManager = LIBJACK_SESSION_MANAGER_NONE;
 static uint gInterposedHints = 0x0;
@@ -84,8 +83,15 @@ static WindowMappingType gCurrentWindowType = WindowMapNone;
 static bool gCurrentWindowMapped = false;
 static bool gCurrentWindowVisible = false;
 
+#ifdef HAVE_X11
 // --------------------------------------------------------------------------------------------------------------------
-// Calling the real functions
+// Function typedefs
+
+typedef int (*XWindowFunc)(Display*, Window);
+typedef int (*XNextEventFunc)(Display*, XEvent*);
+
+// --------------------------------------------------------------------------------------------------------------------
+// Calling the real X11 functions
 
 static int real_XMapWindow(Display* display, Window window)
 {
@@ -350,6 +356,8 @@ int XNextEvent(Display* display, XEvent* event)
     return real_XUnmapWindow(display, gCurrentlyMappedWindow);
 }
 
+#endif // HAVE_X11
+
 // --------------------------------------------------------------------------------------------------------------------
 // Full control helper
 
@@ -373,13 +381,16 @@ int jack_carla_interposed_action(uint action, uint value, void* ptr)
         // show gui
         if (value != 0)
         {
+#ifdef HAVE_X11
             gCurrentWindowVisible = true;
             if (gCurrentlyMappedDisplay == nullptr || gCurrentlyMappedWindow == 0)
+#endif
             {
                 carla_stdout("NOTICE: Interposer show-gui request ignored");
                 return 0;
             }
 
+#ifdef HAVE_X11
             gCurrentWindowMapped = true;
 
             switch (gCurrentWindowType)
@@ -393,19 +404,24 @@ int jack_carla_interposed_action(uint action, uint value, void* ptr)
             default:
                 return 0;
             }
+#endif
         }
         // hide gui
         else
         {
+#ifdef HAVE_X11
             gCurrentWindowVisible = false;
             if (gCurrentlyMappedDisplay == nullptr || gCurrentlyMappedWindow == 0)
+#endif
             {
                 carla_stdout("NOTICE: Interposer hide-gui request ignored");
                 return 0;
             }
 
+#ifdef HAVE_X11
             gCurrentWindowMapped = false;
             return real_XUnmapWindow(gCurrentlyMappedDisplay, gCurrentlyMappedWindow);
+#endif
         }
         break;
 
@@ -413,8 +429,10 @@ int jack_carla_interposed_action(uint action, uint value, void* ptr)
         gCurrentWindowType      = WindowMapNone;
         gCurrentWindowMapped    = false;
         gCurrentWindowVisible   = false;
+#ifdef HAVE_X11
         gCurrentlyMappedDisplay = nullptr;
         gCurrentlyMappedWindow  = 0;
+#endif
         return 0;
     }