[TASK] Add instructions to build for arch linux.

README.md

@@ -3,8 +3,17 @@ This repository contains a small QT4/C++ based project which implements basic im
 
 # Building and running
 
+This project requires qt4 to build and run:
 <pre>
 qmake
 make
 ./imageviewer-qt4
 </pre>
+
+
+For Arch Linux, there is qtchooser.
+Using it, you can use
+<pre>
+QT_SELECT=4 qmake
+</pre>
+to create the Makefile.

imageviewer-qt4.pro

@@ -1,15 +1,15 @@
- HEADERS       = imageviewer-qt4.h
- SOURCES       = imageviewer-qt4.cpp \
+HEADERS = imageviewer-qt4.h
+SOURCES = imageviewer-qt4.cpp \
           imageviewer-main-qt4.cpp
 
- # install
- target.path = $$[QT_INSTALL_EXAMPLES]/widgets/imageviewer
- sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS imageviewer.pro
- sources.path = $$[QT_INSTALL_EXAMPLES]/widgets/imageviewer
- INSTALLS += target sources
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/imageviewer
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS imageviewer.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/widgets/imageviewer
+INSTALLS += target sources
 
- symbian: include($$QT_SOURCE_TREE/examples/symbianpkgrules.pri)
+symbian: include($$QT_SOURCE_TREE/examples/symbianpkgrules.pri)
 
- wince*: {
+wince*: {
   DEPLOYMENT_PLUGIN += qjpeg qmng qgif
- }
+}