--- mozilla-release-239e434d6d2b8e1e2b697c3416d1e96d48fe98e5/gfx/2d/ScaledFontFontconfig.cpp~	2018-03-22 21:46:41.000000000 +0100
+++ mozilla-release-239e434d6d2b8e1e2b697c3416d1e96d48fe98e5/gfx/2d/ScaledFontFontconfig.cpp	2018-03-31 12:33:56.794222766 +0200
@@ -397,7 +397,7 @@
   FcPatternAddDouble(pattern, FC_PIXEL_SIZE, aSize);
   aInstanceData.SetupPattern(pattern);
 
-  cairo_font_face_t* font = cairo_ft_font_face_create_for_pattern(pattern, nullptr, 0);
+  cairo_font_face_t* font = cairo_ft_font_face_create_for_pattern(pattern);
   if (cairo_font_face_status(font) != CAIRO_STATUS_SUCCESS) {
     gfxWarning() << "Failed creating Cairo font face for Fontconfig pattern";
     FcPatternDestroy(pattern);
--- mozilla-release-239e434d6d2b8e1e2b697c3416d1e96d48fe98e5/gfx/thebes/gfxFcPlatformFontList.cpp~	2018-03-22 21:46:41.000000000 +0100
+++ mozilla-release-239e434d6d2b8e1e2b697c3416d1e96d48fe98e5/gfx/thebes/gfxFcPlatformFontList.cpp	2018-03-31 13:14:40.191812247 +0200
@@ -728,9 +728,7 @@
     }
 
     cairo_font_face_t *face =
-        cairo_ft_font_face_create_for_pattern(aRenderPattern,
-                                              coords.Elements(),
-                                              coords.Length());
+        cairo_ft_font_face_create_for_pattern(aRenderPattern);
 
     if (mFontData) {
         // for data fonts, add the face/data pointer to the cairo font face