diff --git a/lib/jkqtcommon.pri b/lib/jkqtcommon.pri
index 6fcbc7bc715..715dafeedd4 100644
--- a/lib/jkqtcommon.pri
+++ b/lib/jkqtcommon.pri
@@ -48,7 +48,8 @@ isEmpty(JKQTP_COMMON_PRI_INCLUDED) {
                $$PWD/jkqtcommon/jkqtpicons.cpp \
                $$PWD/jkqtcommon/jkqtpcsstools.cpp \
                $$PWD/jkqtcommon/jkqtpcachingtools.cpp \
-               $$PWD/jkqtcommon/jkqtpconcurrencytools.cpp 
+               $$PWD/jkqtcommon/jkqtpconcurrencytools.cpp \
+               $$PWD/jkqtcommon/jkqtpexpected.cpp
 
 
     INCLUDEPATH += $$PWD
diff --git a/lib/jkqtcommon/CMakeLists.txt b/lib/jkqtcommon/CMakeLists.txt
index 5a0d0098df2..4efd608de20 100644
--- a/lib/jkqtcommon/CMakeLists.txt
+++ b/lib/jkqtcommon/CMakeLists.txt
@@ -30,6 +30,7 @@ target_sources(${lib_name} PRIVATE
     jkqttools.cpp
     jkqtpicons.cpp
     jkqtpcsstools.cpp
+    jkqtpexpected.cpp
 )
 # ... and add headers
 target_sources(${lib_name} PUBLIC FILE_SET HEADERS TYPE HEADERS
diff --git a/lib/jkqtcommon/jkqtpcsstools.cpp b/lib/jkqtcommon/jkqtpcsstools.cpp
index 3f1394b2ca5..7ff680bf9c3 100644
--- a/lib/jkqtcommon/jkqtpcsstools.cpp
+++ b/lib/jkqtcommon/jkqtpcsstools.cpp
@@ -23,6 +23,8 @@
 #include "jkqtcommon/jkqtpcodestructuring.h"
 #include <exception>
 #include <QMetaEnum>
+#include <QSet>
+#include <QVector>
 
 
 JKQTPCSSParser::RawErrorTag_t JKQTPCSSParser::RawErrorTag={};
diff --git a/lib/jkqtcommon/jkqtpexpected.cpp b/lib/jkqtcommon/jkqtpexpected.cpp
new file mode 100644
index 00000000000..f6e82ba1be8
--- /dev/null
+++ b/lib/jkqtcommon/jkqtpexpected.cpp
@@ -0,0 +1,22 @@
+/*
+    Copyright (c) 2008-2022 Jan W. Krieger (<jan@jkrieger.de>)
+
+    last modification: $LastChangedDate$  (revision $Rev$)
+
+    This software is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License (LGPL) as published by
+    the Free Software Foundation, either version 2.1 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License (LGPL) for more details.
+
+    You should have received a copy of the GNU Lesser General Public License (LGPL)
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+
+#include "jkqtpexpected.h"
diff --git a/lib/jkqtcommon/jkqtpexpected.h b/lib/jkqtcommon/jkqtpexpected.h
index e303d770667..99295e1a79e 100644
--- a/lib/jkqtcommon/jkqtpexpected.h
+++ b/lib/jkqtcommon/jkqtpexpected.h
@@ -35,7 +35,7 @@ struct JKQTPExpectedUnexpectedType {};
  *
  *  \see JKQTPExpected, JKQTPExpectedUnexpectedType
  */
-inline constexpr JKQTPExpectedUnexpectedType JKQTPUnexpected {};
+#define JKQTPUnexpected JKQTPExpectedUnexpectedType()
 
 /** \brief an "expected" datatype, which can either represent a function result of type \c T or an error of type \c E
  *  \ingroup jkqtptools_general