updated INSTALL.txt for cmake

INSTALL.txt

@@ -1,28 +1,8 @@
 For a quick install, just follow these steps:
 
-tar -xzvf qjoypad-4.?.tgz
-cd qjoypad-4.?/src
-./config
-make
+tar -xzvf qjoypad-4.*.tgz
+mkdir qjoypad-4.*/build
+cd qjoypad-4.*/build
+cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release
+make -j`nproc`
 make install
-
-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.
-