Checking Qt version, updating building requirement.

--HG--
branch : develop

README

@@ -15,12 +15,12 @@ The standalone binary packages support the following platforms:
 Windows XP SP2 or later
 Ubuntu Linux 11.10 (32-bit) or later
 
-Building the sources requires Qt 5.0.0 or later.
+Building the sources requires Qt 5.1.0 or later.
 
 Compiling Valentina
 ====================
 Prerequisites:
-   * Qt 5.0.0 or later (On Unix development packages needed)
+   * Qt 5.1.0 or later (On Unix development packages needed)
    * mercurial
    * On Unix:
      - ccache

Valentina.pri

@@ -0,0 +1,22 @@
+defineTest(minQtVersion) {
+    maj = $$1
+    min = $$2
+    patch = $$3
+    isEqual(QT_MAJOR_VERSION, $$maj) {
+        isEqual(QT_MINOR_VERSION, $$min) {
+            isEqual(QT_PATCH_VERSION, $$patch) {
+                return(true)
+            }
+            greaterThan(QT_PATCH_VERSION, $$patch) {
+                return(true)
+            }
+        }
+        greaterThan(QT_MINOR_VERSION, $$min) {
+            return(true)
+        }
+    }
+    greaterThan(QT_MAJOR_VERSION, $$maj) {
+        return(true)
+    }
+    return(false)
+}

Valentina.pro

@@ -1,2 +1,10 @@
+include(Valentina.pri)
+
+#version check qt
+!minQtVersion(5, 1, 0) {
+    message("Cannot build Valentina with Qt version $${QT_VERSION}.")
+    error("Use at least Qt 5.1.0.")
+}
+
 TEMPLATE = subdirs
 SUBDIRS = src