x11window_xlib: Disable XShm on Android

src/devices/x11window_xlib.c

@@ -27,17 +27,18 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 // Resolve symbols at runtime
 #define X11_DLIB_SYM(sym) static typeof(sym)* sym##_dlib = NULL;
 
-// Check for X11 headers presence
-#if defined(USE_X11) && !(CHECK_INCLUDE(X11/Xlib.h, 1) && CHECK_INCLUDE(X11/Xutil.h, 1) && CHECK_INCLUDE(X11/keysym.h, 1))
+#if !(CHECK_INCLUDE(X11/Xlib.h, 1) && CHECK_INCLUDE(X11/Xutil.h, 1) && CHECK_INCLUDE(X11/keysym.h, 1))
+// No X11 headers found
 #undef USE_X11
 #warning Disabling X11 support as <X11/Xlib.h> is unavailable
-#endif
-
-// Check for XShm header presence
-#if CHECK_INCLUDE(X11/extensions/XShm.h, 1) && CHECK_INCLUDE(sys/ipc.h, 1) && CHECK_INCLUDE(sys/shm.h, 1)
-#define USE_XSHM
-#else
+#elif defined(__ANDROID__)
+// There's no SysV SHM on Android
+#warning Disabling XShm support on Android
+#elif !(CHECK_INCLUDE(X11/extensions/XShm.h, 1) && CHECK_INCLUDE(sys/ipc.h, 1) && CHECK_INCLUDE(sys/shm.h, 1))
+// No XShm headers found
 #warning Disabling XShm support as <X11/extensions/XShm.h> is unavailable
+#else
+#define USE_XSHM
 #endif
 
 #ifdef USE_X11