diff --git a/ax_check_qt.m4 b/ax_check_qt.m4
index 61724b6..3d5ab67 100644
--- a/ax_check_qt.m4
+++ b/ax_check_qt.m4
@@ -104,24 +104,14 @@ AC_DEFUN([AX_CHECK_QT], [
     MOC_FLAGS+=" -DHAVE_$1=1 ${[$1]5_CFLAGS}"
     AM_CXXFLAGS+=" ${[$1]5_CFLAGS}"
     LIBS+=" ${[$1]5_LIBS}"
-    modules=${qt_modules//Qt/Qt5}
-    if test -z "$PKG_REQUIREMENTS"; then
-      PKG_REQUIREMENTS="${modules// /, }"
-    else
-      PKG_REQUIREMENTS="${PKG_REQUIREMENTS}, ${modules// /, }"
-    fi
+    PKG_REQUIREMENTS+=" ${qt_modules//Qt/Qt5}"
     if test -n "${qt_modules_optional}"; then
       PKG_CHECK_MODULES([$1]5_OPTIONAL, [${qt_modules_optional//Qt/Qt5}], [
         AM_CPPFLAGS+=" ${[$1]5_OPTIONAL_CFLAGS}"
         MOC_FLAGS+=" ${[$1]5_OPTIONAL_CFLAGS}"
         AM_CXXFLAGS+=" ${[$1]5_OPTIONAL_CFLAGS}"
         LIBS+=" ${[$1]5_OPTIONAL_LIBS}"
-        modules=${qt_modules_optional//Qt/Qt5}
-        if test -z "$PKG_REQUIREMENTS"; then
-          PKG_REQUIREMENTS="${modules// /, }"
-        else
-          PKG_REQUIREMENTS="${PKG_REQUIREMENTS}, ${modules// /, }"
-        fi
+        PKG_REQUIREMENTS+=" ${qt_modules_optional//Qt/Qt5}"
       ], [
         AC_MSG_NOTICE([Not found: ${qt_modules_optional//Qt/Qt5}])
       ])
@@ -134,24 +124,14 @@ AC_DEFUN([AX_CHECK_QT], [
       MOC_FLAGS+=" -DHAVE_$1=1 ${$1_CFLAGS}"
       AM_CXXFLAGS+=" ${$1_CFLAGS}"
       LIBS+=" ${$1_LIBS}"
-      modules=${qt_modules}
-      if test -z "$PKG_REQUIREMENTS"; then
-        PKG_REQUIREMENTS="${modules// /, }"
-      else
-        PKG_REQUIREMENTS="${PKG_REQUIREMENTS}, ${modules// /, }"
-      fi
+      PKG_REQUIREMENTS+=" ${qt_modules}"
       if test -n "$3"; then
         PKG_CHECK_MODULES($1_OPTIONAL, [${qt_modules_optional}], [
           AM_CPPFLAGS+=" ${$1_OPTIONAL_CFLAGS}"
           MOC_FLAGS+=" ${$1_OPTIONAL_CFLAGS}"
           AM_CXXFLAGS+=" ${$1_OPTIONAL_CFLAGS}"
           LIBS+=" ${$1_OPTIONAL_LIBS}"
-          modules=${qt_modules_optional}
-          if test -z "$PKG_REQUIREMENTS"; then
-            PKG_REQUIREMENTS="${modules// /, }"
-          else
-            PKG_REQUIREMENTS="${PKG_REQUIREMENTS}, ${modules// /, }"
-          fi
+          PKG_REQUIREMENTS+=" ${qt_modules_optional}"
         ], [
           AC_MSG_NOTICE([Not found: ${qt_modules_optional}])
         ])
diff --git a/ax_init_standard_project.m4 b/ax_init_standard_project.m4
index e4ad10a..2d89588 100644
--- a/ax_init_standard_project.m4
+++ b/ax_init_standard_project.m4
@@ -399,11 +399,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
     AM_CPPFLAGS+=" ${$1_CFLAGS}"
     AM_CXXFLAGS+=" ${$1_CFLAGS}"
     LIBS+=" ${$1_LIBS}"
-    if test -z "$PKG_REQUIREMENTS"; then
-      PKG_REQUIREMENTS="$2"
-    else
-      PKG_REQUIREMENTS="${PKG_REQUIREMENTS}, $2"
-    fi
+    PKG_REQUIREMENTS+=" $2"
   ], [
     AC_MSG_WARN([Recommended package $2 for feature $1 not installed])
     if test -n "$4"; then
@@ -435,11 +431,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
           AM_CPPFLAGS+=" ${$1_CFLAGS}"
           AM_CXXFLAGS+=" ${$1_CFLAGS}"
           LIBS+=" ${$1_LIBS}"
-          if test -z "$PKG_REQUIREMENTS"; then
-            PKG_REQUIREMENTS="$pkg"
-          else
-            PKG_REQUIREMENTS="${PKG_REQUIREMENTS}, $pkg"
-          fi
+          PKG_REQUIREMENTS+=" $pkg"
         ], [
           AC_MSG_WARN([Recommended package $pkg for feature $1 not installed])
         ])
diff --git a/configure.ac b/configure.ac
index 2be7382..5996591 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,7 +35,7 @@ AC_ARG_ENABLE(pkcs11-download,
 
 # qt features
 AX_CHECK_QT([QTGUI], [QtCore QtGui], [QtWidgets])
-AX_CHECK_QT([QTNETWORK], [QtNetwork])
+AX_CHECK_QT([QTNETWORK], [Qt5Network >= 5.2])
 CPPFLAGS="${CPPFLAGS} -DQT_NO_KEYWORDS"
 
 # libraries used