qt3: fixed error on path export in profile file

arch/3.5.13/trinity-base/trinity-qt3/PKGBUILD

@@ -152,6 +152,7 @@ build() {
    
    # build rest
    make  
+
 }
 
 package() {
@@ -186,8 +187,8 @@ package() {
    install -d -m755 ${pkgdir}/etc/profile.d/
    echo "export QT3DIR=${_prefix}" > ${pkgdir}/etc/profile.d/qt3.sh
    echo "export QT_XFT=true" >> ${pkgdir}/etc/profile.d/qt3.sh
-echo "export PATH=$PATH:${_prefix}/bin" >> ${pkgdir}/etc/profile.d/qt3.sh
-echo "export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:${_prefix}/pkgconfig" >> ${pkgdir}/etc/profile.d/qt3.sh
+   echo "export PATH+=:${_prefix}/bin" >> ${pkgdir}/etc/profile.d/qt3.sh
+   echo "export PKG_CONFIG_PATH+=:${_prefix}/pkgconfig" >> ${pkgdir}/etc/profile.d/qt3.sh
 
    # ln -sf /opt/qt/bin/qtconfig "${pkgdir}"/opt/qt/bin/qt3config