use %qmake_qt4 macro to ensure proper build flags

bacula.spec

@@ -3,7 +3,7 @@
 
 Name:               bacula
 Version:            7.4.0
-Release:            1%{?dist}
+Release:            2%{?dist}
 Summary:            Cross platform network backup for Linux, Unix, Mac and Windows
 # See LICENSE for details
 License:            AGPLv3 with exceptions
@@ -378,7 +378,6 @@ export CPPFLAGS="$RPM_OPT_FLAGS -I%{_includedir}/ncurses"
 }
 
 %if 0%{?fedora} || 0%{?rhel} >= 6
-export QMAKE=/usr/bin/qmake-qt4
 build --enable-bat
 %else
 build --disable-bat
@@ -393,7 +392,7 @@ make -C examples/nagios/check_bacula
 
 %if 0%{?fedora} || 0%{?rhel} >= 6
 pushd src/qt-console/tray-monitor
-    $QMAKE tray-monitor.pro
+    %{?qmake_qt4}%{!?qmake_qt4:qmake-qt4} tray-monitor.pro
     make %{?_smp_mflags}
     cp -f .libs/bacula-tray-monitor .
 popd
@@ -771,6 +770,9 @@ fi
 %{_libdir}/nagios/plugins/check_bacula
 
 %changelog
+* Mon Feb 01 2016 Rex Dieter <rdieter@fedoraproject.org> - 7.4.0-2
+- use %%qmake_qt4 macro to ensure proper build flags
+
 * Mon Jan 25 2016 Simone Caronni <negativo17@gmail.com> - 7.4.0-1
 - Update to 7.4.0.
 - Rebase patches, remove git patch.