diff --git a/setup/extensions.py b/setup/extensions.py
index b4f9daef39..1b0e50d495 100644
--- a/setup/extensions.py
+++ b/setup/extensions.py
@@ -492,17 +492,21 @@ class Build(Command):
     def build_headless(self):
         if iswindows or isosx:
             return  # Dont have headless operation on these platforms
+        from PyQt5.QtCore import QT_VERSION
         self.info('\n####### Building headless QPA plugin', '#'*7)
         a = Extension.absolutize
         headers = a([
             'calibre/headless/headless_backingstore.h',
             'calibre/headless/headless_integration.h',
-            'calibre/headless/fontconfig_database.h'])
+        ])
         sources = a([
             'calibre/headless/main.cpp',
             'calibre/headless/headless_backingstore.cpp',
             'calibre/headless/headless_integration.cpp',
-            'calibre/headless/fontconfig_database.cpp'])
+        ])
+        if QT_VERSION >= 0x50401:
+            headers.extend(a(['calibre/headless/fontconfig_database.h']))
+            sources.extend(a(['calibre/headless/fontconfig_database.cpp']))
         others = a(['calibre/headless/headless.json'])
         target = self.dest('headless')
         if not self.newer(target, headers + sources + others):
diff --git a/src/calibre/headless/headless_integration.cpp b/src/calibre/headless/headless_integration.cpp
index c8247c2f1c..a89917463a 100644
--- a/src/calibre/headless/headless_integration.cpp
+++ b/src/calibre/headless/headless_integration.cpp
@@ -1,6 +1,11 @@
+#include <QtGlobal>
 #include "headless_integration.h"
 #include "headless_backingstore.h"
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 1))
 #include "fontconfig_database.h"
+#else
+#include <QtPlatformSupport/private/qfontconfigdatabase_p.h>
+#endif
 #ifndef Q_OS_WIN
 #include <QtPlatformSupport/private/qgenericunixeventdispatcher_p.h>
 #else