diff -up mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.cpp.build-el5-fontconfig mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.cpp

--- mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.cpp.build-el5-fontconfig	2015-12-16 16:47:28.000000000 +0100

+++ mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.cpp	2016-01-19 14:20:43.676153725 +0100

@@ -367,7 +367,48 @@ gfxFontconfigFontEntry::gfxFontconfigFon

     // "blanks", effectively assuming that, if the font has a blank glyph,

     // then the author intends any associated character to be rendered

     // blank.

-    mFontPattern = FcFreeTypeQueryFace(mFTFace, ToFcChar8Ptr(""), 0, nullptr);

+    // BACKPORT: FcFreeTypeQueryFace is not available in RHEL5's fontconfig

+    // mFontPattern = FcFreeTypeQueryFace(mFTFace, ToFcChar8Ptr(""), 0, nullptr);

+

+

+    // FC_CHARSET is vital to determine which characters are supported.

+    nsAutoRef<FcCharSet> charset(FcFreeTypeCharSet(mFTFace, nullptr));

+    // If there are no characters then assume we don't know how to read

+    // this font.

+    if (!charset || FcCharSetCount(charset) == 0)

+      return;

+

+    mFontPattern = FcPatternCreate();

+    FcPatternAddCharSet(mFontPattern, FC_CHARSET, charset);

+

+    // FC_PIXEL_SIZE can be important for font selection of fixed-size

+    // fonts.

+    if (!(mFTFace->face_flags & FT_FACE_FLAG_SCALABLE)) {

+      for (FT_Int i = 0; i < mFTFace->num_fixed_sizes; ++i) {

+#if HAVE_FT_BITMAP_SIZE_Y_PPEM

+        double size = FLOAT_FROM_26_6(mFTFace->available_sizes[i].y_ppem);

+#else

+        double size = mFTFace->available_sizes[i].height;

+#endif

+        FcPatternAddDouble (mFontPattern, FC_PIXEL_SIZE, size);

+      }

+

+      // Not sure whether this is important;

+      // imitating FcFreeTypeQueryFace:

+      FcPatternAddBool (mFontPattern, FC_ANTIALIAS, FcFalse);

+    }

+

+    // Setting up the FC_LANGSET property is very difficult with the APIs

+    // available prior to FcFreeTypeQueryFace.  Having no FC_LANGSET

+    // property seems better than having a property with an empty LangSet.

+    // With no FC_LANGSET property, fontconfig sort functions will

+    // consider this face to have the same priority as (otherwise equal)

+    // faces that have support for the primary requested language, but

+    // will not consider any language to have been satisfied (and so will

+    // continue to look for a face with language support in fallback

+    // fonts).

+

+    // END BACKPORT

     // given that we have a FT_Face, not really sure this is possible...

     if (!mFontPattern) {

         mFontPattern = FcPatternCreate();

@@ -1015,9 +1056,12 @@ gfxFcPlatformFontList::gfxFcPlatformFont

     , mAlwaysUseFontconfigGenerics(true)

 {

     // if the rescan interval is set, start the timer

-    int rescanInterval = FcConfigGetRescanInterval(nullptr);

+    // BACKPORT - do not implement rescan interval

+    //int rescanInterval = FcConfigGetRescanInterval(nullptr);

+    int rescanInterval = 0;

     if (rescanInterval) {

-        mLastConfig = FcConfigGetCurrent();

+        nsAutoRef<FcConfig> fc_conf(FcConfigGetCurrent());

+        mLastConfig = fc_conf.out();

         mCheckFontUpdatesTimer = do_CreateInstance("@mozilla.org/timer;1");

         if (mCheckFontUpdatesTimer) {

             mCheckFontUpdatesTimer->

@@ -1131,7 +1175,8 @@ gfxFcPlatformFontList::AddFontSetFamilie

 nsresult

 gfxFcPlatformFontList::InitFontList()

 {

-    mLastConfig = FcConfigGetCurrent();

+    nsAutoRef<FcConfig> fc_conf(FcConfigGetCurrent());

+    mLastConfig = fc_conf.out();

     // reset font lists

     gfxPlatformFontList::InitFontList();

diff -up mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.h.build-el5-fontconfig mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.h

--- mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.h.build-el5-fontconfig	2016-01-19 11:45:08.927745469 +0100

+++ mozilla-aurora/gfx/thebes/gfxFcPlatformFontList.h	2016-01-19 13:49:58.296124911 +0100

@@ -33,7 +33,8 @@ class nsAutoRefTraits<FcConfig> : public

 {

 public:

     static void Release(FcConfig *ptr) { FcConfigDestroy(ptr); }

-    static void AddRef(FcConfig *ptr) { FcConfigReference(ptr); }

+    // AddRef is not supported in older font-config

+    // static void AddRef(FcConfig *ptr) { FcConfigReference(ptr); }

 };

 // Helper classes used for clearning out user font data when cairo font

@@ -290,7 +291,7 @@ protected:

     nsRefPtrHashtable<nsCStringHashKey, gfxFontFamily> mFcSubstituteCache;

     nsCOMPtr<nsITimer> mCheckFontUpdatesTimer;

-    nsCountedRef<FcConfig> mLastConfig;

+    nsAutoRef<FcConfig> mLastConfig;

     // By default, font prefs under Linux are set to simply lookup

     // via fontconfig the appropriate font for serif/sans-serif/monospace.