diff --git a/packaging/win32/README b/packaging/win32/README
index a977b71e5f..28608b9ea2 100644
--- a/packaging/win32/README
+++ b/packaging/win32/README
@@ -19,9 +19,13 @@ to $MSYS_DIR
 from http://www.mingw.org/download.shtml -> Current -> mingwPORT -> (bin, wget-*)
 to $DOWNLOAD_DIR
 
-* Look at defaults and optionally create a file named custom to specify
-  adapted directory variables.  If you want verbose output of any script
-  step, add "set -x" to custom.
+* Look at defaults and create a file named custom to specify adapted directory
+  variables.  If you want verbose output of any script
+  step, add "set -x" to that file.
+
+* Either, download Qt from http://www.trolltech.com/developer/downloads/qt/windows,
+  install it and set QTDIR in custom, like "QTDIR=/c/Qt/4.2.3"; or skip building
+  the AqBanking Setup Wizard by specifying "AQBANKING_WITH_QT=no".
 
 Start/Enter any MSYS shell window. Let the automated build begin by:
 
diff --git a/packaging/win32/defaults b/packaging/win32/defaults
index cd1fa36cdc..21ba3db400 100644
--- a/packaging/win32/defaults
+++ b/packaging/win32/defaults
@@ -231,6 +231,8 @@ set_default KTOBLZCHECK_URL "$SF_MIRROR/ktoblzcheck/ktoblzcheck-1.13.tar.gz"
 set_default AQBANKING_URL "$SF_MIRROR/aqbanking/aqbanking-2.2.9.tar.gz"
 set_default AQBANKING_DIR $GLOBAL_DIR\\aqbanking
 set_default AQBANKING_WITH_QT yes
+# If set to yes, download Qt from http://www.trolltech.com/developer/downloads/qt/windows,
+# install it and set QTDIR in custom, like "QTDIR=/c/Qt/4.2.3".
 
 set_default DOCBOOK_XSL_URL "$SF_MIRROR/docbook/docbook-xsl-1.72.0.zip"
 set_default DOCS_URL "http://svn.gnucash.org/repo/gnucash-docs/trunk"
diff --git a/packaging/win32/install.sh b/packaging/win32/install.sh
index 206de7570b..94541aa7e5 100644
--- a/packaging/win32/install.sh
+++ b/packaging/win32/install.sh
@@ -791,6 +791,7 @@ function inst_qt4() {
     # already useful in itself and that's why it has already been
     # added.
 
+    [ "$QTDIR" ] || die "QTDIR is not set.  Please install Qt and set that variable in custom, or deactivate AQBANKING_WITH_QT"
     export QTDIR=`unix_path ${QTDIR}`  # help configure of aqbanking
     _QTDIR=$QTDIR
     # This section creates .la files for the Qt-4 DLLs so that