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diff --git a/vcl/unx/generic/fontmanager/fontsubst.cxx b/vcl/unx/generic/fontmanager/fontsubst.cxx
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+++ b/vcl/unx/generic/fontmanager/fontsubst.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <unx/geninst.h>
+#include <font/PhysicalFontCollection.hxx>
+#include <font/fontsubstitution.hxx>
+#include <unx/fontmanager.hxx>
+
+// platform specific font substitution hooks
+
+namespace {
+
+class FcPreMatchSubstitution
+:   public vcl::font::PreMatchFontSubstitution
+{
+public:
+    bool FindFontSubstitute( vcl::font::FontSelectPattern& ) const override;
+    typedef ::std::pair<vcl::font::FontSelectPattern, vcl::font::FontSelectPattern> value_type;
+private:
+    typedef ::std::list<value_type> CachedFontMapType;
+    mutable CachedFontMapType maCachedFontMap;
+};
+
+class FcGlyphFallbackSubstitution
+:    public vcl::font::GlyphFallbackFontSubstitution
+{
+    // TODO: add a cache
+public:
+    bool FindFontSubstitute(vcl::font::FontSelectPattern&, LogicalFontInstance* pLogicalFont, OUString& rMissingCodes) const override;
+};
+
+}
+
+void SalGenericInstance::RegisterFontSubstitutors(vcl::font::PhysicalFontCollection* pFontCollection)
+{
+    // register font fallback substitutions
+    static FcPreMatchSubstitution aSubstPreMatch;
+    pFontCollection->SetPreMatchHook( &aSubstPreMatch );
+
+    // register glyph fallback substitutions
+    static FcGlyphFallbackSubstitution aSubstFallback;
+    pFontCollection->SetFallbackHook( &aSubstFallback );
+}
+
+static vcl::font::FontSelectPattern GetFcSubstitute(const vcl::font::FontSelectPattern &rFontSelData, OUString& rMissingCodes)
+{
+    vcl::font::FontSelectPattern aSubstituted(rFontSelData);
+    psp::PrintFontManager& rMgr = psp::PrintFontManager::get();
+    rMgr.Substitute(aSubstituted, rMissingCodes);
+    return aSubstituted;
+}
+
+namespace
+{
+    bool uselessmatch(const vcl::font::FontSelectPattern &rOrig, const vcl::font::FontSelectPattern &rNew)
+    {
+        return
+          (
+            rOrig.maTargetName == rNew.maSearchName &&
+            rOrig.GetWeight() == rNew.GetWeight() &&
+            rOrig.GetItalic() == rNew.GetItalic() &&
+            rOrig.GetPitch() == rNew.GetPitch() &&
+            rOrig.GetWidthType() == rNew.GetWidthType()
+          );
+    }
+
+    class equal
+    {
+    private:
+        const vcl::font::FontSelectPattern& mrAttributes;
+    public:
+        explicit equal(const vcl::font::FontSelectPattern& rAttributes)
+            : mrAttributes(rAttributes)
+        {
+        }
+        bool operator()(const FcPreMatchSubstitution::value_type& rOther) const
+            { return rOther.first == mrAttributes; }
+    };
+}
+
+bool FcPreMatchSubstitution::FindFontSubstitute(vcl::font::FontSelectPattern &rFontSelData) const
+{
+    // We don't actually want to talk to Fontconfig at all for symbol fonts
+    if( rFontSelData.IsSymbolFont() )
+        return false;
+    // StarSymbol is a unicode font, but it still deserves the symbol flag
+    if ( IsStarSymbol(rFontSelData.maSearchName) )
+        return false;
+
+    //see fdo#41556 and fdo#47636
+    //fontconfig can return e.g. an italic font for a non-italic input and/or
+    //different fonts depending on fontsize, bold, etc settings so don't cache
+    //just on the name, cache map all the input and all the output not just map
+    //from original selection to output fontname
+    vcl::font::FontSelectPattern& rPatternAttributes = rFontSelData;
+    CachedFontMapType &rCachedFontMap = maCachedFontMap;
+    CachedFontMapType::iterator itr = std::find_if(rCachedFontMap.begin(), rCachedFontMap.end(), equal(rPatternAttributes));
+    if (itr != rCachedFontMap.end())
+    {
+        // Cached substitution
+        rFontSelData = itr->second;
+        if (itr != rCachedFontMap.begin())
+        {
+            // MRU, move it to the front
+            rCachedFontMap.splice(rCachedFontMap.begin(), rCachedFontMap, itr);
+        }
+        return true;
+    }
+
+    OUString aDummy;
+    const vcl::font::FontSelectPattern aOut = GetFcSubstitute( rFontSelData, aDummy );
+
+    if( aOut.maSearchName.isEmpty() )
+        return false;
+
+    const bool bHaveSubstitute = !uselessmatch( rFontSelData, aOut );
+
+#ifdef DEBUG
+    std::ostringstream oss;
+    oss << "FcPreMatchSubstitution \""
+        << rFontSelData.maTargetName
+        << "\" bipw="
+        << rFontSelData.GetWeight()
+        << rFontSelData.GetItalic()
+        << rFontSelData.GetPitch()
+        << rFontSelData.GetWidthType()
+        << " -> ";
+    if( !bHaveSubstitute )
+        oss << "no substitute available.";
+    else
+        oss << "\""
+            << aOut.maSearchName
+            << "\" bipw="
+            << aOut.GetWeight()
+            << aOut.GetItalic()
+            << aOut.GetPitch()
+            << aOut.GetWidthType();
+    SAL_INFO("vcl.fonts", oss.str());
+#endif
+
+    if( bHaveSubstitute )
+    {
+        rCachedFontMap.push_front(value_type(rFontSelData, aOut));
+        // Fairly arbitrary limit in this case, but I recall measuring max 8
+        // fonts as the typical max amount of fonts in medium sized documents, so make it
+        // a fair chunk larger to accommodate weird documents./
+        if (rCachedFontMap.size() > 256)
+            rCachedFontMap.pop_back();
+        rFontSelData = aOut;
+    }
+
+    return bHaveSubstitute;
+}
+
+bool FcGlyphFallbackSubstitution::FindFontSubstitute(vcl::font::FontSelectPattern& rFontSelData,
+    LogicalFontInstance* /*pLogicalFont*/,
+    OUString& rMissingCodes ) const
+{
+    // We don't actually want to talk to Fontconfig at all for symbol fonts
+    if( rFontSelData.IsSymbolFont() )
+        return false;
+    // StarSymbol is a unicode font, but it still deserves the symbol flag
+    if ( IsStarSymbol(rFontSelData.maSearchName) )
+        return false;
+
+    const vcl::font::FontSelectPattern aOut = GetFcSubstitute( rFontSelData, rMissingCodes );
+    // TODO: cache the unicode + srcfont specific result
+    // FC doing it would be preferable because it knows the invariables
+    // e.g. FC knows the FC rule that all Arial gets replaced by LiberationSans
+    // whereas we would have to check for every size or attribute
+    if( aOut.maSearchName.isEmpty() )
+        return false;
+
+    const bool bHaveSubstitute = !uselessmatch( rFontSelData, aOut );
+
+#ifdef DEBUG
+    std::ostringstream oss;
+    oss << "FcGFSubstitution \""
+        << rFontSelData.maTargetName
+        << "\" bipw="
+        << rFontSelData.GetWeight()
+        << rFontSelData.GetItalic()
+        << rFontSelData.GetPitch()
+        << rFontSelData.GetWidthType()
+        << " -> ";
+    if( !bHaveSubstitute )
+        oss << "no substitute available.";
+    else
+        oss << "\""
+            << aOut.maSearchName
+            << "\" bipw="
+            << aOut.GetWeight()
+            << aOut.GetItalic()
+            << aOut.GetPitch()
+            << aOut.GetWidthType();
+    SAL_INFO("vcl.fonts", oss.str());
+#endif
+
+    if( bHaveSubstitute )
+        rFontSelData = aOut;
+
+    return bHaveSubstitute;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */