.pro make install now working.

src/src.pro

@@ -3,10 +3,7 @@ CONFIG          += shared
 QMAKE_CXXFLAGS  += -std=c++11
 TARGET          =  qmsgpack
 DEFINES         += MSGPACK_MAKE_LIB
-HEADERS         += msgpack_common.h
 VERSION         =  0.1.0
-message($${PWD})
-message($$_PRO_FILE_PWD_)
 
 HEADERS += \
     msgpack_common.h \
@@ -25,3 +22,23 @@ SOURCES += \
     private/qt_types_p.cpp \
     private/unpack_p.cpp \
     private/pack_p.cpp
+
+release: DESTDIR = ../build/release
+debug:   DESTDIR = ../build/debug
+OBJECTS_DIR = $$DESTDIR/obj
+MOC_DIR = $$DESTDIR/moc
+
+HEADERS_INSTALL = \
+    msgpack_common.h \
+    msgpackstream.h \
+    msgpack_export.h \
+    msgpack.h \
+    endianhelper.h
+
+unix {
+    header_files.files = $$HEADERS_INSTALL
+    header_files.path = /usr/include/qmsgpack
+    target.path = /usr/lib
+    INSTALLS += header_files target
+}
+