diff --git a/ax_check_qt.m4 b/ax_check_qt.m4
index 211513a..91c0072 100644
--- a/ax_check_qt.m4
+++ b/ax_check_qt.m4
@@ -1,16 +1,16 @@
 # SYNOPSIS
 #
 #   Check if a module exists:
-#     AX_CXX_CHECK_QT([qt_prefix], [list-of-qt-modules], [optional-modules])
+#     AX_CHECK_QT([qt_prefix], [list-of-qt-modules], [optional-modules])
 #
 #   Abort if a module does not exist:
-#     AX_CXX_REQUIRE_QT([qt_prefix], [list-of-qt-modules], [optional-modules])
+#     AX_REQUIRE_QT([qt_prefix], [list-of-qt-modules], [optional-modules])
 #
 # DESCRIPTIONS
 #
 #    qt_prefix
 #
-#      Each call to AX_CXX_CHECK_QT should have a different prefix
+#      Each call to AX_CHECK_QT should have a different prefix
 #      value (with a few exceptions discussed later on). This value,
 #      usually provided in uppercase, is used as prefix to the
 #      variables holding the compiler flags and libraries reported by
@@ -43,12 +43,18 @@ AC_DEFUN([AX_CXX_QT_TOOL], [
     AC_MSG_CHECKING([for $2])
     AC_ARG_VAR([$1], [path to Qt tool $2])
     $1=${$1:-$(${PKG_CONFIG} --variable=$2_location Qt5Core)}
+    $1=${$1:-$(${PKG_CONFIG} --variable=host_bins Qt5Core)/$2-qt5}
     $1=${$1:-$(${PKG_CONFIG} --variable=host_bins Qt5Core)/$2}
     $1=${$1:-$(${PKG_CONFIG} --variable=$2_location QtCore)}
     $1=${$1:-$(${PKG_CONFIG} --variable=host_bins QtCore)/$2}
+    $1=${$1:-$(${PKG_CONFIG} --variable=host_bins QtCore)/$2-qt4}
     if ! which "${$1%% *}" > /dev/null; then
-      if which "$2" > /dev/null; then
+      if which "$2-qt5" > /dev/null; then
+        $1=$2-qt5
+      elif which "$2" > /dev/null; then
         $1=$2
+      elif which "$2-qt4" > /dev/null; then
+        $1=$2-qt4
       else
         HAVE_$1=0
         $1=""
@@ -179,13 +185,13 @@ qrc_%.cxx: %.qrc
 
 # SYNOPSIS
 #
-#   AX_CXX_CHECK_QT([qt_prefix], [list-of-qt-modules], [optional-modules])
+#   AX_CHECK_QT([qt_prefix], [list-of-qt-modules], [optional-modules])
 #
 # DESCRIPTIONS
 #
 #    qt_prefix
 #
-#      Each call to AX_CXX_CHECK_QT should have a different prefix
+#      Each call to AX_CHECK_QT should have a different prefix
 #      value (with a few exceptions discussed later on). This value,
 #      usually provided in uppercase, is used as prefix to the
 #      variables holding the compiler flags and libraries reported by
diff --git a/ax_init_standard_project.m4 b/ax_init_standard_project.m4
index 24b7568..f8e0b9c 100644
--- a/ax_init_standard_project.m4
+++ b/ax_init_standard_project.m4
@@ -22,21 +22,19 @@ m4_define(x_least, mrw_esyscmd_s([
 # define version number from subversion's revision number:
 # it is taken modulo 256 due to a bug on Apple's MacOSX
 # add to x_minor if revision number is > 256
-m4_define(x_minor_fixed, mrw_esyscmd_s([
+m4_define(x_minor_diff, mrw_esyscmd_s([
   SVN_REVISION="ERROR-UNDEFINED-REVISION-to-be-built-in-subdirectory-of-svn-checkout"
   for path in . .. ../..; do
     if svn info $path 2>&1 > /dev/null; then
       SVN_REVISION=$(LANG= svn info $path | sed -n 's/Last Changed Rev: //p')
       break;
-    fi
+    fi;
   done
   # Mac does not support LEAST > 255
-  echo $ECHO_N $((x_minor+$SVN_REVISION/256))
+  echo $ECHO_N $(($SVN_REVISION/256))
 ]))
 # setup version number
-m4_define(x_version, mrw_esyscmd_s([
-  echo $ECHO_N x_major.x_minor_fixed.x_least
-]))
+m4_define(x_version, [x_major.m4_eval(x_minor+x_minor_diff).x_least])
 
 ## bugreport mail address is taken from <user@host> in first line of AUTHORS
 m4_define(x_bugreport, mrw_esyscmd_s([
@@ -85,7 +83,7 @@ AC_DEFUN([AX_ADD_MAKEFILE_TARGET_DEP], [
 #     $1 = variable name
 AC_DEFUN([AX_SUBST], [
   AC_SUBST([$1])
-  tmp_var=$(echo "${$1}" | awk 1 ORS='\\n')
+  tmp_var=$(echo "${$1}" | awk 1 ORS='\\n' | sed 's,\\n$,,')
   tmp_var=${tmp_var//\"/\\\"}
   tmp_var=${tmp_var//\'/\'\"\'\"\'}
   tmp_var=${tmp_var//#/\\#}
@@ -264,9 +262,9 @@ EOF
 # use this in configure.ac to support C++ libraries
 AC_DEFUN([AX_USE_LIBTOOL], [
   # libtool versioning
-  LIB_MAJOR=m4_eval(x_major+x_minor_fixed)
+  LIB_MAJOR=m4_eval(x_major+x_minor+x_minor_diff)
   LIB_MINOR=x_least
-  LIB_LEAST=x_minor_fixed
+  LIB_LEAST=m4_eval(x_minor+x_minor_diff)
   LIB_VERSION="${LIB_MAJOR}:${LIB_MINOR}:${LIB_LEAST}"
   AM_LDFLAGS="-version-info ${LIB_VERSION}"
   AC_SUBST(AM_LDFLAGS)
diff --git a/bootstrap.sh b/bootstrap.sh
index c347b3d..d873053 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -732,16 +732,33 @@ else
   echo Applications/...;
 fi)
 Source0: %{name}-%{version}.tar.gz
-BuildRequires: gnupg, subversion, automake, autoconf $(if testtag AX_USE_DOXYGEN; then echo -n ", doxygen, graphviz"; fi; if testtag AX_CXX_QT || testtag AX_CXX_CHECK_QT; then echo -n ", qtbase5-devel | libqt4-devel, qtbase5-devel-tools | qt4-devel-tools"; fi)
+BuildRequires: gnupg, subversion, automake, autoconf$(
+    if testtag AX_USE_DOXYGEN; then
+      echo -n ", doxygen, graphviz";
+    fi)
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 %if 0%{?fedora} || 0%{?rhel} || 0%{?rhl} || 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version}
-BuildRequires: pkgconfig, redhat-lsb$(if testtag AX_USE_CPPUNIT; then echo -n ", cppunit-devel"; fi)
-%else%if 0%{?suse_version} || 0%{?sles_version}
-BuildRequires: pkg-config, lsb-release$(if testtag AX_USE_CPPUNIT; then echo -n ", libcppunit-devel"; fi)
-%endif%endif
-%if 0%{?fedora} || 0%{?rhel} || 0%{?rhl}
+BuildRequires: pkgconfig, redhat-lsb$(
+    if testtag AX_USE_CPPUNIT; then
+      echo -n ", cppunit-devel";
+    fi)
+%if ! ( 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version} )
 $(if testtag AX_USE_DOXYGEN; then echo -n "BuildRequires: mscgen"; fi)
+$(if testtag AX_REQUIRE_QT || testtag AX_CHECK_QT; then echo -n "BuildRequires: qt5-qtbase-devel, qt5-qttools, qt5-qtwebkit-devel"; fi)
+%else
+$(if testtag AX_REQUIRE_QT || testtag AX_CHECK_QT; then echo -n "BuildRequires: qt-devel"; fi)
+%endif
+%else%if 0%{?suse_version} || 0%{?sles_version}
+BuildRequires: pkg-config, lsb-release$(
+    if testtag AX_USE_CPPUNIT; then
+      echo -n ", libcppunit-devel";
+    fi)
+%if 0%{?suse_version} < 1200 ||  0%{?sles_version} < 1200
+$(if testtag AX_REQUIRE_QT || testtag AX_CHECK_QT; then echo -n "BuildRequires: libqt4-devel, qt4-x11-tools, libQtWebKit-devel"; fi)
+%else
+$(if testtag AX_REQUIRE_QT || testtag AX_CHECK_QT; then echo -n "BuildRequires: libqt5-qtbase-devel, libqt5-qttools, libQt5WebKit5-devel"; fi)
 %endif
+%endif%endif
 
 %description
 @README@
@@ -753,8 +770,8 @@ fi)
 
 %prep
 %setup -q
-./configure --prefix=/usr \
-            --docdir=/usr/share/doc/packages/@PACKAGE_NAME@ \
+./configure --prefix=/usr \\
+            --docdir=/usr/share/doc/packages/@PACKAGE_NAME@ \\
             --libdir=/usr/%_lib
 
 %build
@@ -784,7 +801,7 @@ fi)
 $(if testtag AX_USE_LIBTOOL; then
 cat <<EOF2
 %package devel
-Summary: C++ Wrapper around OpenSSL, PCSC and Cryptoki (development files)
+Summary: @DESCRIPTION@
 Group: Development/Libraries/C++
 Requires: @PACKAGE_NAME@ = @VERSION@
 
diff --git a/mrw-c++.spec.in b/mrw-c++.spec.in
index 1c270ab..782b84f 100644
--- a/mrw-c++.spec.in
+++ b/mrw-c++.spec.in
@@ -50,7 +50,7 @@ rm -rf $RPM_BUILD_ROOT
 /usr/share/doc/packages/@PACKAGE_NAME@/README
 
 %package devel
-Summary: C++ Wrapper around OpenSSL, PCSC and Cryptoki (development files)
+Summary: @DESCRIPTION@
 Group: Development/Libraries/C++
 Requires: @PACKAGE_NAME@ = @VERSION@