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# Allow building against system-wide graphite2/harfbuzz.

diff --git config/system-headers.mozbuild config/system-headers.mozbuild
index 0c06f581b33b..10f125be25ab 100644
--- config/system-headers.mozbuild
+++ config/system-headers.mozbuild
@@ -1307,6 +1307,19 @@ if CONFIG["MOZ_ENABLE_LIBPROXY"]:
         "proxy.h",
     ]
 
+if CONFIG['MOZ_SYSTEM_GRAPHITE2']:
+    system_headers += [
+        'graphite2/Font.h',
+        'graphite2/Segment.h',
+    ]
+
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    system_headers += [
+        'harfbuzz/hb-glib.h',
+        'harfbuzz/hb-ot.h',
+        'harfbuzz/hb.h',
+    ]
+
 if CONFIG["MOZ_SYSTEM_ICU"]:
     system_headers += [
         "unicode/calendar.h",
diff --git dom/base/moz.build dom/base/moz.build
index 14c9f9dd96fb..bd1c8f241e9b 100644
--- dom/base/moz.build
+++ dom/base/moz.build
@@ -606,6 +606,9 @@ FINAL_LIBRARY = "xul"
 if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
     CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 GeneratedFile(
     "UseCounterList.h",
     script="gen-usecounters.py",
diff --git gfx/graphite2/geckoextra/moz.build gfx/graphite2/geckoextra/moz.build
new file mode 100644
index 000000000000..24e8d7a03274
--- /dev/null
+++ gfx/graphite2/geckoextra/moz.build
@@ -0,0 +1,21 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS.graphite2 += [
+    'include/GraphiteExtra.h',
+    'include/GraphiteStructsForRLBox.h',
+]
+
+UNIFIED_SOURCES += [
+    '../geckoextra/src/GraphiteExtra.cpp',
+]
+
+CXXFLAGS += CONFIG['MOZ_GRAPHITE2_CFLAGS']
+
+# Match bundled graphite2 configuration
+AllowCompilerWarnings()
+
+FINAL_LIBRARY = 'xul'
diff --git gfx/harfbuzz/README-mozilla.fbsd gfx/harfbuzz/README-mozilla.fbsd
new file mode 100644
index 000000000000..2a10eb1e2b42
--- /dev/null
+++ gfx/harfbuzz/README-mozilla.fbsd
@@ -0,0 +1,4 @@
+The in-tree copy may be omitted during build by --with-system-harfbuzz.
+Make sure to keep pkg-config version check within toolkit/moz.configure in sync
+with checkout version or increment latest tag by one if it's not based
+on upstream release.
diff --git gfx/moz.build gfx/moz.build
index 56ea317bedfc..07dd7f66f1bc 100644
--- gfx/moz.build
+++ gfx/moz.build
@@ -10,6 +10,14 @@ with Files("**"):
 with Files("wr/**"):
     BUG_COMPONENT = ("Core", "Graphics: WebRender")
 
+if CONFIG["MOZ_SYSTEM_GRAPHITE2"]:
+    DIRS += ["graphite2/geckoextra"]
+else:
+    DIRS += ["graphite2/src" ]
+
+if not CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    DIRS += ["harfbuzz/src"]
+
 DIRS += [
     "cairo",
     "2d",
@@ -19,8 +27,6 @@ DIRS += [
     "qcms",
     "gl",
     "layers",
-    "graphite2/src",
-    "harfbuzz/src",
     "ots/src",
     "thebes",
     "ipc",
diff --git gfx/skia/generate_mozbuild.py gfx/skia/generate_mozbuild.py
index c161d24df853..8c7dd395b371 100755
--- gfx/skia/generate_mozbuild.py
+++ gfx/skia/generate_mozbuild.py
@@ -91,6 +91,9 @@ if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
         '-Wno-unused-private-field',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk', 'android'):
     LOCAL_INCLUDES += [
         "/gfx/cairo/cairo/src",
diff --git gfx/skia/moz.build gfx/skia/moz.build
index 83aa2957a938..0859316a1f09 100644
--- gfx/skia/moz.build
+++ gfx/skia/moz.build
@@ -601,6 +601,9 @@ if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
         '-Wno-unused-private-field',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk', 'android'):
     LOCAL_INCLUDES += [
         "/gfx/cairo/cairo/src",
diff --git gfx/thebes/moz.build gfx/thebes/moz.build
index fd1fcf236d81..958d3f699ffd 100644
--- gfx/thebes/moz.build
+++ gfx/thebes/moz.build
@@ -293,7 +293,13 @@ if CONFIG["MOZ_WAYLAND"]:
 
 LOCAL_INCLUDES += CONFIG["SKIA_INCLUDES"]
 
-DEFINES["GRAPHITE2_STATIC"] = True
+if CONFIG["MOZ_SYSTEM_GRAPHITE2"]:
+    CXXFLAGS += CONFIG["MOZ_GRAPHITE2_CFLAGS"]
+else:
+    DEFINES["GRAPHITE2_STATIC"] = True
+
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
 
 CXXFLAGS += ["-Werror=switch"]
 
diff --git intl/unicharutil/util/moz.build intl/unicharutil/util/moz.build
index 2bbd00415cae..f66bd37695d4 100644
--- intl/unicharutil/util/moz.build
+++ intl/unicharutil/util/moz.build
@@ -24,6 +24,9 @@ UNIFIED_SOURCES += [
     "nsUnicodeProperties.cpp",
 ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 include("/ipc/chromium/chromium-config.mozbuild")
 
 GeneratedFile(
diff --git netwerk/dns/moz.build netwerk/dns/moz.build
index c926d14707d1..35a3f33e2885 100644
--- netwerk/dns/moz.build
+++ netwerk/dns/moz.build
@@ -112,6 +112,9 @@ GeneratedFile(
     "etld_data.inc", script="prepare_tlds.py", inputs=["effective_tld_names.dat"]
 )
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 # need to include etld_data.inc
 LOCAL_INCLUDES += [
     "/netwerk/base",
diff --git old-configure.in old-configure.in
index 2ca88a20a4b3..88bc9b873eff 100644
--- old-configure.in
+++ old-configure.in
@@ -1067,6 +1067,27 @@ fi
 AC_DEFINE_UNQUOTED(MOZ_MACBUNDLE_ID,$MOZ_MACBUNDLE_ID)
 AC_SUBST(MOZ_MACBUNDLE_ID)
 
+dnl ========================================================
+dnl Check for graphite2
+dnl ========================================================
+if test -n "$MOZ_SYSTEM_GRAPHITE2"; then
+    dnl graphite2.pc has bogus version, check manually
+    _SAVE_CFLAGS=$CFLAGS
+    CFLAGS="$CFLAGS $MOZ_GRAPHITE2_CFLAGS"
+    AC_TRY_COMPILE([ #include <graphite2/Font.h>
+                     #define GR2_VERSION_REQUIRE(major,minor,bugfix)  \
+                             ( GR2_VERSION_MAJOR * 10000 + GR2_VERSION_MINOR \
+                               * 100 + GR2_VERSION_BUGFIX >= \
+                               (major) * 10000 + (minor) * 100 + (bugfix) )
+                   ], [
+                     #if !GR2_VERSION_REQUIRE(1,3,14)
+                     #error "Insufficient graphite2 version."
+                     #endif
+                   ], [],
+                   [AC_MSG_ERROR([--with-system-graphite2 requested but no working libgraphite2 found])])
+    CFLAGS=$_SAVE_CFLAGS
+fi
+
 dnl ========================================================
 dnl = Child Process Name for IPC
 dnl ========================================================
diff --git toolkit/library/moz.build toolkit/library/moz.build
index 76746f308011..f6844f4c400b 100644
--- toolkit/library/moz.build
+++ toolkit/library/moz.build
@@ -292,6 +292,12 @@ if CONFIG["MOZ_SYSTEM_PNG"]:
 if CONFIG["MOZ_SYSTEM_WEBP"]:
     OS_LIBS += CONFIG["MOZ_WEBP_LIBS"]
 
+if CONFIG["MOZ_SYSTEM_GRAPHITE2"]:
+    OS_LIBS += CONFIG["MOZ_GRAPHITE2_LIBS"]
+
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    OS_LIBS += CONFIG["MOZ_HARFBUZZ_LIBS"]
+
 if CONFIG["MOZ_SYSTEM_LIBEVENT"]:
     OS_LIBS += CONFIG["MOZ_LIBEVENT_LIBS"]
 
diff --git toolkit/moz.configure toolkit/moz.configure
index a060a59f728f..f0778d1ae2d6 100644
--- toolkit/moz.configure
+++ toolkit/moz.configure
@@ -1218,6 +1218,26 @@ def enable_cairo_ft(target, tree_freetype, freetype2_info):
 set_config("MOZ_ENABLE_CAIRO_FT", True, when=enable_cairo_ft)
 set_config("CAIRO_FT_CFLAGS", ft2_info.cflags, when=enable_cairo_ft)
 
+# Graphite2
+# ==============================================================
+option("--with-system-graphite2",
+       help="Use system graphite2 (located with pkgconfig)")
+
+system_graphite2 = pkg_check_modules("MOZ_GRAPHITE2", "graphite2",
+                                     when="--with-system-graphite2")
+
+set_config("MOZ_SYSTEM_GRAPHITE2", depends_if(system_graphite2)(lambda _: True))
+
+# HarfBuzz
+# ==============================================================
+option("--with-system-harfbuzz",
+       help="Use system harfbuzz (located with pkgconfig)")
+
+system_harfbuzz = pkg_check_modules("MOZ_HARFBUZZ", "harfbuzz >= 2.7.4",
+                                    when="--with-system-harfbuzz")
+
+set_config("MOZ_SYSTEM_HARFBUZZ", depends_if(system_harfbuzz)(lambda _: True))
+
 
 # WebDriver (HTTP / BiDi)
 # ==============================================================