@@ -, +, @@ 
 quazip
---
 INSTALL     |  2 ++
 src/src.pro | 16 +++++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)
--- a/INSTALL	
+++ a/INSTALL	
@@ -51,6 +51,8 @@ TRANSDIR_MERKAARTOR=<path>  - where will the Merkaartor translations be installe
 TRANSDIR_SYSTEM=<path>      - where your global Qt translation directory is
 NODEBUG=1                   - release target
 NOUSEWEBKIT                 - disable use of WebKit (Yahoo adapter)
+SYSTEM_QTSA                 - use system copy of qtsingleapplication instead of internal
+SYSTEM_QUAZIP               - use system copy of quazip instead of internal
 
 
 3. Run your build tool, make for posix like systems, nmake for
--- a/src/src.pro	
+++ a/src/src.pro	
@@ -6,11 +6,17 @@ include (Config.pri)
 #Custom config
 include(Custom.pri)
 
-include(../3rdparty/qtsingleapplication-2.6_1-opensource/src/qtsingleapplication.pri)
-DEFINES += QUAZIP_STATIC
-include(../3rdparty/quazip-0.7/quazip.pri)
-
-#LIBS += -lquazip
+isEmpty(SYSTEM_QTSA) {
+  include(../3rdparty/qtsingleapplication-2.6_1-opensource/src/qtsingleapplication.pri)
+} else {
+  CONFIG += qtsingleapplication
+}
+isEmpty(SYSTEM_QUAZIP) {
+  DEFINES += QUAZIP_STATIC
+  include(../3rdparty/quazip-0.7/quazip.pri)
+} else {
+  LIBS += -lquazip
+}
 
 #Qt Version
 QT_VERSION = $$[QT_VERSION]
--