commit 717bba28411c
Author: Jory A. Pratt <anarchy@gentoo.org>
Date:   Thu Jun 13 11:53:00 2019 -0700

    Bug 1559213 - Allow to use system av1 libs instead of bundled.
---
 config/external/moz.build      |  5 +++--
 config/system-headers.mozbuild |  8 ++++++++
 dom/media/platforms/moz.build  |  5 +++++
 toolkit/moz.configure          | 19 ++++++++++++++++++-
 4 files changed, 34 insertions(+), 3 deletions(-)

diff --git config/external/moz.build config/external/moz.build
index 03e4fa143bd1..a67d10b11fe6 100644
--- config/external/moz.build
+++ config/external/moz.build
@@ -40,8 +40,9 @@ if not CONFIG["MOZ_SYSTEM_LIBVPX"]:
     external_dirs += ["media/libvpx"]
 
 if CONFIG["MOZ_AV1"]:
-    external_dirs += ["media/libaom"]
-    external_dirs += ["media/libdav1d"]
+    if not CONFIG["MOZ_SYSTEM_AV1"]:
+        external_dirs += ["media/libaom"]
+        external_dirs += ["media/libdav1d"]
 
 if not CONFIG["MOZ_SYSTEM_PNG"]:
     external_dirs += ["media/libpng"]
diff --git config/system-headers.mozbuild config/system-headers.mozbuild
index bcf5c4925564..48964a999a9b 100644
--- config/system-headers.mozbuild
+++ config/system-headers.mozbuild
@@ -1305,6 +1305,14 @@ if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
         'harfbuzz/hb.h',
     ]
 
+if CONFIG['MOZ_SYSTEM_AV1']:
+    system_headers += [
+        'aom/aom_decoder.h',
+        'aom/aomdx.h',
+        'aom/aom_image.h',
+        'dav1d/dav1d.h',
+    ]
+
 if CONFIG['MOZ_SYSTEM_LIBVPX']:
     system_headers += [
         'vpx_mem/vpx_mem.h',
diff --git dom/media/platforms/moz.build dom/media/platforms/moz.build
index 092cee0c9b66..38e45de5b5f0 100644
--- dom/media/platforms/moz.build
+++ dom/media/platforms/moz.build
@@ -78,6 +78,11 @@ if CONFIG["MOZ_AV1"]:
         "agnostic/AOMDecoder.cpp",
         "agnostic/DAV1DDecoder.cpp",
     ]
+    if CONFIG['MOZ_SYSTEM_AV1']:
+        CXXFLAGS += CONFIG['MOZ_SYSTEM_LIBAOM_CFLAGS']
+        OS_LIBS += CONFIG['MOZ_SYSTEM_LIBAOM_LIBS']
+        CXXFLAGS += CONFIG['MOZ_SYSTEM_LIBDAV1D_CFLAGS']
+        OS_LIBS += CONFIG['MOZ_SYSTEM_LIBDAV1D_LIBS']
 
 if CONFIG["MOZ_OMX"]:
     EXPORTS += [
diff --git toolkit/moz.configure toolkit/moz.configure
index 82b5a59acf42..e2329560b42b 100644
--- toolkit/moz.configure.orig	2021-04-13 16:12:34.770032000 +0200
+++ toolkit/moz.configure	2021-04-18 00:03:41.432698000 +0200
@@ -538,7 +538,23 @@
         return True
 
 
-@depends(target, when=av1 & compile_environment)
+option("--with-system-av1",
+       help="Use system av1 (located with pkgconfig)")
+
+system_libaom_info = pkg_check_modules("MOZ_SYSTEM_LIBAOM", "aom >= 1.0.0",
+                                       when="--with-system-av1")
+
+system_libdav1d_info = pkg_check_modules("MOZ_SYSTEM_LIBDAV1D", "dav1d >= 0.1.1",
+                                         when="--with-system-av1")
+
+@depends(system_libaom_info, system_libdav1d_info)
+def system_av1(system_libaom_info, system_libdav1d_info):
+    has_av1_libs = False
+    if system_libaom_info and system_libdav1d_info:
+        has_av1_libs = True
+    return has_av1_libs
+
+@depends(target, when=av1 & depends(system_av1)(lambda v: not v) & compile_environment)
 def dav1d_asm(target):
     if target.cpu in ("aarch64", "x86", "x86_64"):
         return True
@@ -554,6 +570,7 @@
 set_define("MOZ_DAV1D_ASM", dav1d_asm)
 set_config("MOZ_AV1", av1)
 set_define("MOZ_AV1", av1)
+set_config("MOZ_SYSTEM_AV1", depends_if(system_av1)(lambda _: True))
 
 # Built-in fragmented MP4 support.
 # ==============================================================