commit 25a5572d5cd137aa6d893e09a00bd39908a59a18
Author: Christoph Moench-Tegeder <cmt@burggraben.net>
Date:   Tue Sep 10 22:23:32 2024 +0200

    based on:
     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.

diff --git config/external/moz.build config/external/moz.build
index a24b470396cf..547f5f5c9e04 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 dom/media/platforms/moz.build dom/media/platforms/moz.build
index 61536cc6e225..29cf635bbb44 100644
--- dom/media/platforms/moz.build
+++ dom/media/platforms/moz.build
@@ -71,6 +71,11 @@ 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 media/ffvpx/libavcodec/moz.build media/ffvpx/libavcodec/moz.build
index 6f09049a6068..90a82a19a9d1 100644
--- media/ffvpx/libavcodec/moz.build
+++ media/ffvpx/libavcodec/moz.build
@@ -119,10 +119,16 @@ if not CONFIG['MOZ_FFVPX_AUDIOONLY']:
         'vp9recon.c',
         'vpx_rac.c',
     ]
-    USE_LIBS += [
-        'dav1d',
-        'media_libdav1d_asm',
-    ]
+    if CONFIG["MOZ_SYSTEM_AV1"]:
+        CFLAGS += CONFIG['MOZ_SYSTEM_LIBDAV1D_CFLAGS']
+        OS_LIBS += CONFIG['MOZ_SYSTEM_LIBDAV1D_LIBS']
+        CFLAGS += CONFIG['MOZ_SYSTEM_LIBAOM_CFLAGS']
+        OS_LIBS += CONFIG['MOZ_SYSTEM_LIBAOM_LIBS']
+    else:
+        USE_LIBS += [
+            'dav1d',
+            'media_libdav1d_asm',
+        ]
     if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
         LOCAL_INCLUDES += ['/media/mozva']
         SOURCES += [
diff --git media/libopus/moz.build media/libopus/moz.build
index 943aee79ee99..4ad07e3e98af 100644
--- media/libopus/moz.build
+++ media/libopus/moz.build
@@ -58,7 +58,7 @@ if not CONFIG["MOZ_SAMPLE_TYPE_FLOAT32"]:
     DEFINES["FIXED_POINT"] = 1
     DEFINES["DISABLE_FLOAT_API"] = True
 
-if CONFIG["OS_ARCH"] == "Linux":
+if CONFIG["OS_ARCH"] in ("FreeBSD", "Linux"):
     OS_LIBS += [
         "m",
     ]
diff --git media/libvorbis/moz.build media/libvorbis/moz.build
index cd17d4f89759..816edd72a000 100644
--- media/libvorbis/moz.build
+++ media/libvorbis/moz.build
@@ -45,7 +45,7 @@ LOCAL_INCLUDES += ['lib']
 if CONFIG['OS_ARCH'] == 'SunOS':
     DEFINES['HAVE_ALLOCA_H'] = True
 
-if CONFIG["OS_ARCH"] == "Linux":
+if CONFIG["OS_ARCH"] in ("FreeBSD", "Linux"):
     OS_LIBS += [
         "m",
     ]
diff --git toolkit/moz.configure toolkit/moz.configure
index 1f85d2831f2f..07294b93f850 100644
--- toolkit/moz.configure
+++ toolkit/moz.configure
@@ -883,7 +883,23 @@ def av1(value):
         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
@@ -899,6 +915,7 @@ set_config("MOZ_DAV1D_ASM", dav1d_asm)
 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))
 
 # JXL Image Codec Support
 # ==============================================================