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CMakeModules/DetectBrowser.cmake

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+# DetectBrowser.cmake -- Detect web browser launcher application
+
+# Set default command to open browser. Override with -DWEB_BROWSER=...
+if (APPLE OR MSVC)
+    # opening the web browser is hardcoded for Mac and Windows,
+    # so this doesn't really have an effect...
+    set(WEB_BROWSER "open")
+else()
+    if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+        # "xdg-open" provides run-time detection of user's preferred browser on (most) Linux.
+        if (NOT LINUX_DISTRO MATCHES "Debian")
+            set(WEB_BROWSER "xdg-open" CACHE STRING "Command to open web browser")
+        else()
+            # Debian is different: "sensible-browser" provides auto-detection
+            set(WEB_BROWSER "sensible-browser" CACHE STRING "Command to open web browser")
+        endif()
+    else()
+        # Default for non Linux/non Mac/non Windows platform...
+        set(WEB_BROWSER "firefox" CACHE STRING "Command to open web browser")
+    endif()
+    message(STATUS "Web browser launcher command is: ${WEB_BROWSER}")
+endif()