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diff -up firefox-68.0/config/system-headers.mozbuild.firefox-pipewire firefox-68.0/config/system-headers.mozbuild
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--- firefox-68.0/config/system-headers.mozbuild.firefox-pipewire	2019-07-01 22:30:26.000000000 +0200
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+++ firefox-68.0/config/system-headers.mozbuild	2019-07-08 15:26:15.397161627 +0200
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@@ -314,6 +314,7 @@ system_headers = [
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     'Gestalt.h',
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     'getopt.h',
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     'gio/gio.h',
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+    'gio/gunixfdlist.h',
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     'glibconfig.h',
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     'glib.h',
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     'glib-object.h',
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@@ -607,6 +608,7 @@ system_headers = [
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     'Pgenerr.h',
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     'PGenErr.h',
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     'Ph.h',
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+    'pipewire/pipewire.h',
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     'pixman.h',
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     'pk11func.h',
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     'pk11pqg.h',
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diff -up firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_generic_gn/moz.build.firefox-pipewire firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_generic_gn/moz.build
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--- firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_generic_gn/moz.build.firefox-pipewire	2019-07-01 22:30:33.000000000 +0200
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+++ firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_generic_gn/moz.build	2019-07-08 15:26:15.397161627 +0200
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@@ -194,6 +194,28 @@ if CONFIG["OS_TARGET"] == "Linux":
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         "/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_linux.cc"
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     ]
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+# PipeWire specific files
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+if CONFIG["OS_TARGET"] == "Linux":
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+
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+    DEFINES["WEBRTC_USE_PIPEWIRE"] = "1"
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+
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+    OS_LIBS += [
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+        "rt",
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+        "pipewire-0.2",
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+        "glib-2.0",
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+        "gio-2.0",
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+        "gobject-2.0"
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+    ]
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+
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+    CXXFLAGS += CONFIG['TK_CFLAGS']
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+
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+    UNIFIED_SOURCES += [
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+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/linux/base_capturer_pipewire.cc",
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+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/linux/screen_capturer_pipewire.cc",
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+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/linux/window_capturer_pipewire.cc"
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+    ]
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+
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+
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 if CONFIG["OS_TARGET"] == "NetBSD":
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     DEFINES["USE_X11"] = "1"
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diff -up firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_options.h.firefox-pipewire firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_options.h
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--- firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_options.h.firefox-pipewire	2019-07-08 16:42:13.936254926 +0200
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+++ firefox-68.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_options.h	2019-07-08 16:42:17.509264974 +0200
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@@ -141,7 +141,7 @@ class DesktopCaptureOptions {
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   bool disable_effects_ = true;
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   bool detect_updated_region_ = false;
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 #if defined(WEBRTC_USE_PIPEWIRE)
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-  bool allow_pipewire_ = false;
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+  bool allow_pipewire_ = true;
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 #endif
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 };
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