QGCExternalLibs: Test Qt version before adding AirMap

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

QGCExternalLibs.pri

@@ -153,20 +153,22 @@ contains (DEFINES, DISABLE_AIRMAP) {
     message("Skipping support for AirMap (manual override from user_config.pri)")
 } else {
     AIRMAPD_PATH = $$PWD/libs/airmapd
-    MacBuild {
+    contains(QT_VERSION, ˆ5\\.11\..*) {
-        exists($${AIRMAPD_PATH}/macOS/Qt.5.11.0) {
+        MacBuild {
-            message("Including support for AirMap for macOS")
+            exists($${AIRMAPD_PATH}/macOS/Qt.5.11.0) {
-            LIBS += -L$${AIRMAPD_PATH}/macOS/Qt.5.11.0 -lairmap-qt
+                message("Including support for AirMap for macOS")
-            DEFINES += QGC_AIRMAP_ENABLED
+                LIBS += -L$${AIRMAPD_PATH}/macOS/Qt.5.11.0 -lairmap-qt
-        }
+                DEFINES += QGC_AIRMAP_ENABLED
-    } else:LinuxBuild {
+            }
-        exists($${AIRMAPD_PATH}/linux/Qt.5.11.0) {
+        } else:LinuxBuild {
-            message("Including support for AirMap for Linux")
+            exists($${AIRMAPD_PATH}/linux/Qt.5.11.0) {
-            LIBS += -L$${AIRMAPD_PATH}/linux/Qt.5.11.0 -lairmap-qt
+                message("Including support for AirMap for Linux")
-            DEFINES += QGC_AIRMAP_ENABLED
+                LIBS += -L$${AIRMAPD_PATH}/linux/Qt.5.11.0 -lairmap-qt
+                DEFINES += QGC_AIRMAP_ENABLED
+            }
+        } else {
+            message("Skipping support for Airmap (unsupported platform)")
         }
-    } else {
-        message("Skipping support for Airmap (unsupported platform)")
     }
     contains (DEFINES, QGC_AIRMAP_ENABLED) {
         INCLUDEPATH += \