fixes up some problems with the documentation, allows the overriding of the qmake binary used during config

git-svn-id: svn://svn.code.sf.net/p/qjoypad/code/trunk@126 c05e91a0-76c8-4ec0-b377-ef19ce7cc080

INSTALL.txt

@@ -1,9 +1,28 @@
 For a quick install, just follow these steps:
 
-tar -xzvf qjoypad-3.?.tgz
-cd qjoypad-3.?/src
+tar -xzvf qjoypad-4.?.tgz
+cd qjoypad-4.?/src
 ./config
 make
 make install
 
-If those steps don't work for you, give the README a look!
+If those steps don't work for you, here are some common problems:
+
+Compilations fails with along the lines of:
+axis.h:21: error: expected class-name before ‘{’ token
+axis.h:22: error: ISO C++ forbids declaration of ‘Q_OBJECT’ with no type
+axis.h:24: error: expected ‘;’ before ‘friend’
+axis.h:29: error: ‘QTextStream’ has not been declared
+axis.h:31: error: ‘QTextStream’ has not been declared
+axis.h:40: error: ‘QString’ does not name a type
+axis.h:44: error: ‘QString’ does not name a type
+axis.h:89: error: ISO C++ forbids declaration of ‘QTimer’ with no type
+
+Most likely you're using the Qt3 version of qmake; QJoyPad needs to use Qt4 to 
+work properly.  The config script is supposed to detect this properly, but in
+the event it fails you should find what the proper executable is (if you think
+you've found it run it with the --version option to make sure it is for Qt
+4.0 or greater).  Then rerun the config script with the --qmake4bin=BIN option,
+where BIN is the executable name of the proper qmake binary, or a path to the
+proper qmake binary.
+