Make possible specifying additional paths via command line appending
the default search path instead of setting it.
Forwarded: yes
--- a/qcs-unix.pro
+++ b/qcs-unix.pro
@@ -5,13 +5,13 @@
 }
 
 # Set default paths
-DEFAULT_CSOUND_API_INCLUDE_DIRS = /usr/local/include/csound \
+DEFAULT_CSOUND_API_INCLUDE_DIRS += /usr/local/include/csound \
 	/usr/include/csound
-DEFAULT_CSOUND_INTERFACES_INCLUDE_DIRS = $${DEFAULT_CSOUND_API_INCLUDE_DIRS}
-DEFAULT_CSOUND_LIBRARY_DIRS = /usr/local/lib \
+DEFAULT_CSOUND_INTERFACES_INCLUDE_DIRS += $${DEFAULT_CSOUND_API_INCLUDE_DIRS}
+DEFAULT_CSOUND_LIBRARY_DIRS += /usr/local/lib \
 	/usr/lib
-DEFAULT_LIBSNDFILE_INCLUDE_DIRS = /usr/include
-DEFAULT_LIBSNDFILE_LIBRARY_DIRS = /usr/lib
+DEFAULT_LIBSNDFILE_INCLUDE_DIRS += /usr/include
+DEFAULT_LIBSNDFILE_LIBRARY_DIRS += /usr/lib
 build32:DEFAULT_CSOUND_LIBS = libcsound.so \
 	libcsound.a
 build64:DEFAULT_CSOUND_LIBS = libcsound64.so \
@@ -19,19 +19,19 @@
 #CSND_LIB = libcsnd.so
 LIBSNDFILE_LIB = libsndfile.so
 
-DEFAULT_PYTHONQT_INCLUDE_DIRS = /usr/local/include \
+DEFAULT_PYTHONQT_INCLUDE_DIRS += /usr/local/include \
 	/usr/include
-DEFAULT_PYTHONQT_LIBRARY_DIRS = /usr/local/lib \
+DEFAULT_PYTHONQT_LIBRARY_DIRS += /usr/local/lib \
         /usr/lib\
         ../../../PythonQt2.0.1 \
         ../PythonQt2.0.1 \
         PythonQt2.0.1
-DEFAULT_PYTHONQT_TREE_DIRS = ../../../PythonQt2.0.1 \
+DEFAULT_PYTHONQT_TREE_DIRS += ../../../PythonQt2.0.1 \
         ../PythonQt2.0.1 \
         PythonQt2.0.1
-PYTHONQT_LIB = libPythonQt_QtAll$${DEBUG_EXT}.so
+PYTHONQT_LIB += libPythonQt_QtAll$${DEBUG_EXT}.so
 
-DEFAULT_PORTMIDI_DIR =  /usr/local/include
+DEFAULT_PORTMIDI_DIR +=  /usr/local/include
 
 # Do configuration step
 include(config.pri)