Build QtWebEngine/Chromium: fontconfig/fontconfig.h not found

FAILED: obj/content/browser/browser/font_utils_linux.o
/usr/bin/g++ -MMD -MF obj/content/browser/browser/font_utils_linux.o.d -DENABLE_SCREEN_CAPTURE=1 -DV8_DEPRECATION_WARNINGS -DENABLE_PLUGINS=1 -DENABLE_PDF=1 -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_OPENSSL_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DENABLE_WEBRTC=1 -DDISABLE_NACL -DENABLE_TASK_MANAGER=1 -DENABLE_THEMES=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -DFIELDTRIAL_TESTING_ENABLED -DTOOLKIT_QT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DCONTENT_IMPLEMENTATION -DGL_GLEXT_PROTOTYPES -DUSE_GLX -DUSE_EGL -DLEVELDB_PLATFORM_CHROMIUM=1 -DSK_IGNORE_DW_GRAY_FIX -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSK_SUPPORT_GPU=1 -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DHAVE_PTHREAD -DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE -DFEATURE_ENABLE_SSL -DFEATURE_ENABLE_VOICEMAIL -DEXPAT_RELATIVE_PATH -DGTEST_RELATIVE_PATH -DNO_MAIN_THREAD_WRAPPING -DNO_SOUND_SYSTEM -DWEBRTC_CHROMIUM_BUILD -DWEBRTC_POSIX -DWEBRTC_LINUX -DSSL_USE_OPENSSL -DHAVE_OPENSSL_SSL_H -DFEATURE_ENABLE_SSL -DNO_MAIN_THREAD_WRAPPING -Igen -I../../3rdparty/chromium -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -Igen -I../../3rdparty/chromium/third_party/khronos -I../../3rdparty/chromium/gpu -I../../3rdparty/chromium/third_party/leveldatabase -I../../3rdparty/chromium/third_party/leveldatabase/src -I../../3rdparty/chromium/third_party/leveldatabase/src/include -I../../3rdparty/chromium/skia/config -I../../3rdparty/chromium/skia/ext -I../../3rdparty/chromium/third_party/skia/include/c -I../../3rdparty/chromium/third_party/skia/include/config -I../../3rdparty/chromium/third_party/skia/include/core -I../../3rdparty/chromium/third_party/skia/include/effects -I../../3rdparty/chromium/third_party/skia/include/images -I../../3rdparty/chromium/third_party/skia/include/lazy -I../../3rdparty/chromium/third_party/skia/include/pathops -I../../3rdparty/chromium/third_party/skia/include/pdf -I../../3rdparty/chromium/third_party/skia/include/pipe -I../../3rdparty/chromium/third_party/skia/include/ports -I../../3rdparty/chromium/third_party/skia/include/utils -I../../3rdparty/chromium/third_party/skia/include/gpu -I../../3rdparty/chromium/third_party/skia/src/gpu -I../../3rdparty/chromium/third_party/skia/src/sksl -I../../3rdparty/chromium/third_party/protobuf/src -Igen/protoc_out -I../../3rdparty/chromium/third_party/protobuf/src -Igen/blink -I../../3rdparty/chromium/third_party/icu/source/common -I../../3rdparty/chromium/third_party/icu/source/i18n -I../../3rdparty/chromium/third_party/libwebm/source -I../../3rdparty/chromium/third_party/boringssl/src/include -Igen -I../../3rdparty/chromium/third_party/ced/src -I../../3rdparty/chromium/third_party/WebKit -Igen/third_party/WebKit -I../../3rdparty/chromium/v8/include -Igen/v8/include -I../../3rdparty/chromium/v8/include -Igen/v8/include -I../../3rdparty/chromium/third_party/mesa/src/include -I../../3rdparty/chromium/third_party/angle/src/common/third_party/numerics -Igen/angle -I../../3rdparty/chromium/third_party/libyuv/include -I../../3rdparty/chromium/third_party/re2/src -I../../3rdparty/chromium/third_party/zlib -Igen/ui/resources -Igen/ui/resources -I../../3rdparty/chromium/third_party/webrtc_overrides -I../../3rdparty/chromium/testing/gtest/include -I../../3rdparty/chromium/third_party -I../../3rdparty/chromium/third_party/webrtc_overrides -I../../3rdparty/chromium/third_party -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -pipe -pthread -m64 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-missing-field-initializers -Wno-unused-parameter -O2 -fno-ident -fdata-sections -ffunction-sections -g0 -fvisibility=hidden -fno-threadsafe-statics -fvisibility-inlines-hidden -std=gnu++11 -Wno-narrowing -fno-rtti -fno-exceptions -c ../../3rdparty/chromium/content/browser/renderer_host/font_utils_linux.cc -o obj/content/browser/browser/font_utils_linux.o
../../3rdparty/chromium/content/browser/renderer_host/font_utils_linux.cc:6:35: fatal error: fontconfig/fontconfig.h: No such file or directory
 #include <fontconfig/fontconfig.h>
                                   ^
compilation terminated.

diff -Naur qtwebengine/src/3rdparty/chromium/content/browser/BUILD.gn qtwebengine/src/3rdparty/chromium/content/browser/BUILD.gn
--- qtwebengine/src/3rdparty/chromium/content/browser/BUILD.gn
+++ qtwebengine/src/3rdparty/chromium/content/browser/BUILD.gn
@@ -121,6 +121,7 @@
     "//third_party/WebKit/public:offscreen_canvas_mojo_bindings",
     "//third_party/WebKit/public:resources",
     "//third_party/angle:angle_common",
+    "//third_party/fontconfig",
     "//third_party/icu",
     "//third_party/kasko:kasko_features",
     "//third_party/libyuv",
diff -Naur qtwebengine/src/3rdparty/chromium/ui/gfx/BUILD.gn qtwebengine/src/3rdparty/chromium/ui/gfx/BUILD.gn
--- qtwebengine/src/3rdparty/chromium/ui/gfx/BUILD.gn
+++ qtwebengine/src/3rdparty/chromium/ui/gfx/BUILD.gn
@@ -121,6 +121,7 @@
     "//base:i18n",
     "//base/third_party/dynamic_annotations",
     "//skia",
+    "//third_party/fontconfig",
     "//third_party/harfbuzz-ng",
     "//third_party/libpng",
     "//third_party/qcms",

# Main variables
# --------------
BIN=$PREFIX/lib/qt5/bin
QTCONF=$BIN/qt.conf
VER=$PKG_VERSION
CXXFLAGS=-fno-delete-null-pointer-checks
# Qt/Chromium needs "python" to be Python 2:
PATH=$(dirname $(which python2)):$PATH



# Compile
# -------
chmod +x configure

# This might only work on Linux.  Check
# https://github.com/conda/conda-recipes/tree/master/qt5 for OS X support

MAKE_JOBS=$CPU_COUNT

./configure -prefix $PREFIX \
            -bindir $PREFIX/lib/qt5/bin \
            -headerdir $PREFIX/include/qt5 \
            -archdatadir $PREFIX/lib/qt5 \
            -datadir $PREFIX/share/qt5 \
            -opensource \
            -confirm-license \
            -release \
            -shared \
            -I $PREFIX/include \
            -L $PREFIX/lib \
            -nomake examples \
            -nomake tests \
            -qt-pcre \
            -qt-xcb \
            -qt-xkbcommon \
            -qt-libjpeg \
            -dbus

LD_LIBRARY_PATH=$PREFIX/lib make --quiet -j $MAKE_JOBS
make install