Bump required Qt version to 5.6

It seems natural to use the LTS release as the minimum required version,
and we get rid of a number of #ifdefs.

[ChangeLog] Building qbs now requires Qt 5.6

Change-Id: I327ebb179a20e6372fa5ae765e0f3753fb9e9efa
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/qbs.pro b/qbs.pro
index af6ba896a..43c668c98 100644
--- a/qbs.pro
+++ b/qbs.pro
@@ -23,9 +23,9 @@ defineTest(minQtVersion) {
     return(false)
 }
 
-!minQtVersion(5, 4, 0) {
+!minQtVersion(5, 6, 0) {
     message("Cannot build qbs with Qt version $${QT_VERSION}.")
-    error("Use at least Qt 5.4.0.")
+    error("Use at least Qt 5.6.0.")
 }
 
 TEMPLATE = subdirs