# Allow building against system-wide graphite2/harfbuzz.

diff --git config/system-headers.mozbuild config/system-headers.mozbuild
index 7620b4d00623..09d3db5ca8c0 100644
--- config/system-headers.mozbuild
+++ config/system-headers.mozbuild
@@ -1300,6 +1300,19 @@ if CONFIG['MOZ_ENABLE_CONTENTMANAGER']:
         'SelectSingleContentItemPage.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_LIBVPX']:
     system_headers += [
         'vpx_mem/vpx_mem.h',
diff --git dom/base/moz.build dom/base/moz.build
index 8e19020315ae..2fcdbb6f7b42 100644
--- dom/base/moz.build
+++ dom/base/moz.build
@@ -495,6 +495,9 @@ if CONFIG['MOZ_BUILD_APP'] in ['browser', 'mobile/android', 'xulrunner']:
 if CONFIG['MOZ_X11']:
     CXXFLAGS += CONFIG['TK_CFLAGS']
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 GENERATED_FILES += [
     'PropertyUseCounterMap.inc',
     'UseCounterList.h',
diff --git gfx/graphite2/moz-gr-update.sh gfx/graphite2/moz-gr-update.sh
index faaab1b17971..04eff5f09882 100644
--- gfx/graphite2/moz-gr-update.sh
+++ gfx/graphite2/moz-gr-update.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 # Script used to update the Graphite2 library in the mozilla source tree
+# and bump version for --with-system-graphite2
 
 # This script lives in gfx/graphite2, along with the library source,
 # but must be run from the top level of the mozilla-central tree.
@@ -37,12 +38,16 @@ echo "See" $0 "for update procedure." >> gfx/graphite2/README.mozilla
 #find gfx/graphite2/ -name "*.cpp" -exec perl -p -i -e "s/<cstdio>/<stdio.h>/;s/Windows.h/windows.h/;" {} \;
 #find gfx/graphite2/ -name "*.h" -exec perl -p -i -e "s/<cstdio>/<stdio.h>/;s/Windows.h/windows.h/;" {} \;
 
+# chase version for --with-system-graphite2
+perl -p -i -e "s/[0-9]+\,[0-9]+\,[0-9]+/$RELEASE/ and tr/./,/ \
+  if /GR2_VERSION_REQUIRE/" old-configure.in
+
 # summarize what's been touched
 echo Updated to $RELEASE.
 echo Here is what changed in the gfx/graphite2 directory:
 echo
 
-hg stat gfx/graphite2
+hg stat old-configure.in gfx/graphite2
 
 echo
 echo If gfx/graphite2/src/files.mk has changed, please make corresponding
diff --git gfx/harfbuzz/README-mozilla gfx/harfbuzz/README-mozilla
index 22c76a7df020..a01490bd49ee 100644
--- gfx/harfbuzz/README-mozilla
+++ gfx/harfbuzz/README-mozilla
@@ -15,3 +15,8 @@ from within the gfx/harfbuzz directory.
 
 If the collection of source files changes, manual updates to moz.build may be
 needed as we don't use the upstream makefiles.
+
+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 771f652e837a..3b358d84e384 100644
--- gfx/moz.build
+++ gfx/moz.build
@@ -10,6 +10,12 @@ with Files('**'):
 if CONFIG['MOZ_TREE_CAIRO']:
     DIRS += ['cairo']
 
+if not CONFIG['MOZ_SYSTEM_GRAPHITE2']:
+    DIRS += ['graphite2/src' ]
+
+if not CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    DIRS += ['harfbuzz/src']
+
 DIRS += [
     '2d',
     'ycbcr',
@@ -18,8 +24,6 @@ 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 e06ae3457a47..93faa61594a3 100755
--- gfx/skia/generate_mozbuild.py
+++ gfx/skia/generate_mozbuild.py
@@ -148,6 +148,9 @@ 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 ('gtk3', 'android'):
     CXXFLAGS += CONFIG['MOZ_CAIRO_CFLAGS']
     CXXFLAGS += CONFIG['CAIRO_FT_CFLAGS']
diff --git gfx/thebes/moz.build gfx/thebes/moz.build
index 56f1b9fe3f4b..0ac1100b0df3 100644
diff --git intl/unicharutil/util/moz.build intl/unicharutil/util/moz.build
index cb1233c56d7e..06fb1f9f174b 100644
--- intl/unicharutil/util/moz.build
+++ intl/unicharutil/util/moz.build
@@ -25,4 +25,7 @@ UNIFIED_SOURCES += [
     'nsUnicodeProperties.cpp',
 ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 FINAL_LIBRARY = 'xul'
diff --git netwerk/dns/moz.build netwerk/dns/moz.build
index 79c26e3e7001..c4d93bc5f7dc 100644
--- netwerk/dns/moz.build
+++ netwerk/dns/moz.build
@@ -76,3 +76,6 @@ USE_LIBS += ['icu']
 
 if CONFIG['CC_TYPE'] in ('clang', 'gcc'):
     CXXFLAGS += ['-Wno-error=shadow']
+
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
diff --git toolkit/library/moz.build toolkit/library/moz.build
index 24f940e1ed7e..079a575adec3 100644
--- toolkit/library/moz.build
+++ toolkit/library/moz.build
@@ -226,6 +226,12 @@ 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 9297e4d6f501..d8e273887e4b 100644
--- toolkit/moz.configure
+++ toolkit/moz.configure
@@ -894,6 +894,26 @@ add_old_configure_assignment('FT2_LIBS',
 add_old_configure_assignment('FT2_CFLAGS',
                              ft2_info.cflags)
 
+# 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 >= 2.4.0',
+                                    when='--with-system-harfbuzz')
+
+set_config('MOZ_SYSTEM_HARFBUZZ', depends_if(system_harfbuzz)(lambda _: True))
+
 # Marionette remote protocol
 # ==============================================================
 #
