diff --git a/tools/install/win/create_installer.bat b/tools/install/win/create_installer.bat
index 66b577460e..95dc8bd5ac 100644
--- a/tools/install/win/create_installer.bat
+++ b/tools/install/win/create_installer.bat
@@ -119,6 +119,11 @@ for /F %%i in ('dir /b "%OPENSSLDIR%\*.*"') do (
 :: http://users.pandora.be/Jan.Van.hijfte/qtforfpc/fpcqt4.html
 SET QTINFDIR=%LAZSVNBINDIR%\%FPCFULLTARGET%\qt
 
+SET QT5INFDIR=%LAZSVNBINDIR%\%FPCFULLTARGET%\qt5
+for /F %%i in ('dir /b "%QT5INFDIR%\*.*"') do (
+   SET HASQT5=1
+)
+
 ::---------------------------------------------------------------------
 FOR /F %%L IN ('%FPCBINDIR%\gdate.exe +%%Y%%m%%d') DO SET DATESTAMP=%%L
 SET BUILDDRIVE=%BUILDDIR:~,2%
diff --git a/tools/install/win/lazarus.de.isl b/tools/install/win/lazarus.de.isl
index 76cf0da00c..7a42c190d3 100644
--- a/tools/install/win/lazarus.de.isl
+++ b/tools/install/win/lazarus.de.isl
@@ -8,6 +8,8 @@ CleanUp=Aufr
 
 InstallQtLocal=QT4-Interface-DLL installieren
 InstallQt=QT4-Interface-DLL global installieren
+InstallQt5Local=QT5-Interface-DLL installieren
+InstallQt5Global=QT5-Interface-DLL global installieren
 InstallChm=CHM-Hilfedateien installieren
 InstallOpenSSL=Openssl dll installieren (Benötigt für den Online-Packet-Manager)
 InstallOpenSSLGlobal=Openssl dll global installieren
diff --git a/tools/install/win/lazarus.def.isl b/tools/install/win/lazarus.def.isl
index d8ac6aac99..1c3a3ce5cd 100644
--- a/tools/install/win/lazarus.def.isl
+++ b/tools/install/win/lazarus.def.isl
@@ -8,6 +8,8 @@ CleanUp=Clean up:
 
 InstallQtLocal=Install Qt4 interface DLL
 InstallQt=Globally install Qt4 interface DLL
+InstallQt5Local=Install Qt5 interface DLL
+InstallQt5Global=Globally install Qt5 interface DLL
 InstallChm=Install CHM help files
 InstallOpenSSL=Install openssl libraries (required by OnlinePackageManager)
 InstallOpenSSLGlobal=Globally Install openssl libraries
diff --git a/tools/install/win/lazarus.iss b/tools/install/win/lazarus.iss
index e54c7256ef..cde24c1af7 100644
--- a/tools/install/win/lazarus.iss
+++ b/tools/install/win/lazarus.iss
@@ -20,6 +20,8 @@ EnableISX=true
 #define SetupDate GetEnv('DateStamp')
 #define BuildDir GetEnv('BuildDir')
 #define QtInfDir GetEnv('QTINFDIR')
+#define HasQT5 GetEnv('HASQT5')
+#define Qt5InfDir GetEnv('QT5INFDIR')
 #define HasOpenSSL GetEnv('HASOPENSSL')
 #define OpenSSLDir GetEnv('OPENSSLDIR')
 #define IDEWidgetSet GetEnv('IDE_WidgetSet')
@@ -80,13 +82,25 @@ Name: installhelp; Description: {cm:InstallChm}; Types: custom full
 #endif
 
 #if FPCTargetOS=="win32"
-#if IDEWidgetSet!="qt"
+;// #if IDEWidgetSet!="qt"
 Name: install4qtintfdll; Description: {cm:InstallQtLocal}; Types: custom full; Flags: checkablealone
-#else
-Name: install4qtintfdll; Description: {cm:InstallQtLocal}; Types: custom full compact; Flags: checkablealone fixed
-#endif
+;// #else
+;//Name: install4qtintfdll; Description: {cm:InstallQtLocal}; Types: custom full compact; Flags: checkablealone fixed
+;// #endif
 Name: install4qtintfdll/global; Description: {cm:InstallQt}; Types: full; Flags: dontinheritcheck
 #endif
+
+#ifdef HasQT5
+#if HasQT5!=""
+#if IDEWidgetSet!="qt"
+Name: install5qtintfdll; Description: {cm:InstallQt5Local}; Types: custom full; Flags: checkablealone
+#else
+Name: install5qtintfdll; Description: {cm:InstallQt5Local}; Types: custom full compact; Flags: checkablealone fixed
+#endif
+Name: install5qtintfdll/global; Description: {cm:InstallQt5Global}; Types: full; Flags: dontinheritcheck
+#endif
+#endif
+
 #ifdef HasOpenSSL
 #if HasOpenSSL!=""
 Name: installopenssl; Description: {cm:InstallOpenSSL}; Types: custom full compact; Flags: checkablealone
@@ -123,18 +137,30 @@ Name: {code:GetPCPForDelete}userschemes\*.xml; Type: files; Tasks: delusersettin
 [Files]
 Source: {#BuildDir}\*.*; DestDir: {app}; Flags: recursesubdirs
 Source: environmentoptions.xml; DestDir: {app}; AfterInstall: UpdateEnvironmentOptions; DestName: environmentoptions.xml
+
 #if FPCTargetOS=="win32"
-#if IDEWidgetSet=="qt"
-Source: {#QtInfDir}\*.dll; DestDir: {sys}; Flags: sharedfile replacesameversion
-#else
+;//#if IDEWidgetSet=="qt"
+;//Source: {#QtInfDir}\*.dll; DestDir: {sys}; Flags: sharedfile replacesameversion
+;//#else
 Source: {#QtInfDir}\*.dll; DestDir: {sys}; Flags: sharedfile replacesameversion; Components: install4qtintfdll/global
-#endif
+;//#endif
 Source: {#QtInfDir}\*.dll; DestDir: {app}; Components: install4qtintfdll
 #if FPCVersion=="2.2.0"
 Source: {#BuildDir}\fpc\{#FPCVersion}\bin\{#FPCFullTarget}\cpp.exe; DestDir: {app}\ide; MinVersion: 1,0
 #endif
 #endif
 
+#ifdef HasQT5
+#if HasQT5!=""
+#if IDEWidgetSet=="qt"
+Source: {#Qt5InfDir}\*.dll; DestDir: {sys}; Flags: sharedfile replacesameversion
+#else
+Source: {#Qt5InfDir}\*.dll; DestDir: {sys}; Flags: sharedfile replacesameversion; Components: install5qtintfdll/global
+#endif
+Source: {#Qt5InfDir}\*.dll; DestDir: {app}; Components: install5qtintfdll
+#endif
+#endif
+
 #ifdef CHMHELPFILES
 #if CHMHELPFILES!=""
 Source: {#CHMHELPFILES}\*.*; DestDir: {app}\docs\chm; Components: installhelp; Flags: recursesubdirs