diff --git a/media/ffvpx/libavcodec/moz.build b/media/ffvpx/libavcodec/moz.build
index 6c63745d35..b6501a64fd 100644
--- a/media/ffvpx/libavcodec/moz.build
+++ b/media/ffvpx/libavcodec/moz.build
@@ -180,6 +180,9 @@ if CONFIG['GNU_CXX']:
 if CONFIG['GNU_CC'] and CONFIG['CC_VERSION'] >= '10.0.0':
     CFLAGS += ['-fcommon']
 
+if CONFIG['OS_TARGET'] == 'Linux':
+    SOURCES['cabac.c'].flags += ['-fno-lto']
+
 USE_LIBS += [
      'mozavutil'
 ]
diff --git a/modules/zlib/src/chunkcopy.h b/modules/zlib/src/chunkcopy.h
index 70a5686008..c9923034cb 100644
--- a/modules/zlib/src/chunkcopy.h
+++ b/modules/zlib/src/chunkcopy.h
@@ -42,6 +42,11 @@ typedef __m128i z_vec128i_t;
 #endif
 #endif
 
+#ifndef _MSC_VER
+#define _declspec(x) __attribute__((x))
+#define align(x) aligned(x)
+#endif
+
 /*
  * chunk copy type: the z_vec128i_t type size should be exactly 128-bits
  * and equal to CHUNKCOPY_CHUNK_SIZE.
diff --git a/widget/gtk/mozgtk/mozgtk.c b/widget/gtk/mozgtk/mozgtk.c
index dd6260b78d..a62bf02c0f 100644
--- a/widget/gtk/mozgtk/mozgtk.c
+++ b/widget/gtk/mozgtk/mozgtk.c
@@ -504,6 +504,7 @@ STUB(gtk_window_set_skip_taskbar_hint)
 STUB(gtk_window_set_title)
 STUB(gtk_window_set_transient_for)
 STUB(gtk_window_set_type_hint)
+STUB(gtk_window_set_keep_above)
 STUB(gtk_window_set_wmclass)
 STUB(gtk_window_unfullscreen)
 STUB(gtk_window_unmaximize)