diff --git a/gpxsee.pro b/gpxsee.pro
index 46cb2120..bca60b0e 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -1,12 +1,16 @@
 TARGET = GPXSee
 VERSION = 5.16
+
 QT += core \
     gui \
     network
-greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
-greaterThan(QT_MAJOR_VERSION, 4): QT += printsupport
-lessThan(QT_VERSION, 5.4): QT += opengl
-macx: QT += opengl
+greaterThan(QT_MAJOR_VERSION, 4) {
+    QT += widgets
+    QT += printsupport
+}
+lessThan(QT_MAJOR_VERSION, 5) {QT += opengl}
+equals(QT_MAJOR_VERSION, 5) : lessThan(QT_MINOR_VERSION, 5) {QT += opengl}
+
 INCLUDEPATH += ./src
 HEADERS += src/config.h \
     src/common/staticassert.h \
@@ -235,6 +239,7 @@ SOURCES += src/main.cpp \
     src/map/jnxmap.cpp \
     src/map/krovak.cpp \
     src/map/map.cpp
+
 RESOURCES += gpxsee.qrc
 TRANSLATIONS = lang/gpxsee_cs.ts \
     lang/gpxsee_sv.ts \
@@ -243,6 +248,7 @@ TRANSLATIONS = lang/gpxsee_cs.ts \
     lang/gpxsee_fi.ts \
     lang/gpxsee_fr.ts \
     lang/gpxsee_pl.ts
+
 macx {
     ICON = icons/gpxsee.icns
     QMAKE_INFO_PLIST = pkg/Info.plist
@@ -283,5 +289,5 @@ win32 {
         icons/wpt.ico
     DEFINES += _USE_MATH_DEFINES
 }
+
 DEFINES += APP_VERSION=\\\"$$VERSION\\\"
-greaterThan(QT_VERSION, 5.10.0): DEFINES += ENABLE_HTTP2
diff --git a/src/GUI/optionsdialog.cpp b/src/GUI/optionsdialog.cpp
index f4a5c2a5..ad67c5b1 100644
--- a/src/GUI/optionsdialog.cpp
+++ b/src/GUI/optionsdialog.cpp
@@ -12,7 +12,6 @@
 #include <QRadioButton>
 #include <QLabel>
 #include <QSysInfo>
-#include "config.h"
 #include "icons.h"
 #include "colorbox.h"
 #include "stylecombobox.h"
diff --git a/src/GUI/optionsdialog.h b/src/GUI/optionsdialog.h
index c28d562e..d63b990d 100644
--- a/src/GUI/optionsdialog.h
+++ b/src/GUI/optionsdialog.h
@@ -4,6 +4,7 @@
 #include <QDialog>
 #include "palette.h"
 #include "units.h"
+#include "config.h"
 
 
 class ColorBox;
diff --git a/src/config.h b/src/config.h
index f6d5dafe..8b009d83 100644
--- a/src/config.h
+++ b/src/config.h
@@ -46,4 +46,8 @@
 #define TILES_DIR              USER_DIR + QString("/tiles")
 #define TRANSLATIONS_DIR       GLOBAL_DIR + QString("/translations")
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 1))
+#define ENABLE_HTTP2
+#endif // QT >= 5.10.1
+
 #endif /* CONFIG_H */
diff --git a/src/map/downloader.cpp b/src/map/downloader.cpp
index 6b17b93c..feb938a5 100644
--- a/src/map/downloader.cpp
+++ b/src/map/downloader.cpp
@@ -2,7 +2,6 @@
 #include <QFileInfo>
 #include <QNetworkRequest>
 #include <QBasicTimer>
-#include "config.h"
 #include "downloader.h"
 
 
diff --git a/src/map/downloader.h b/src/map/downloader.h
index 41c964c8..16ecfd43 100644
--- a/src/map/downloader.h
+++ b/src/map/downloader.h
@@ -7,6 +7,7 @@
 #include <QList>
 #include <QSet>
 #include <QHash>
+#include "config.h"
 
 
 class Download