diff --git a/qmake/generators/makefile.cpp b/qmake/generators/makefile.cpp
index 3dd63b4590a..0dc367a38c7 100644
--- a/qmake/generators/makefile.cpp
+++ b/qmake/generators/makefile.cpp
@@ -1420,31 +1420,31 @@ MakefileGenerator::writeInstalls(QTextStream &t, bool noBuild)
 }
 
 QString
-MakefileGenerator::var(const ProKey &var)
+MakefileGenerator::var(const ProKey &var) const
 {
     return val(project->values(var));
 }
 
 QString
-MakefileGenerator::val(const ProStringList &varList)
+MakefileGenerator::val(const ProStringList &varList) const
 {
     return valGlue(varList, "", " ", "");
 }
 
 QString
-MakefileGenerator::val(const QStringList &varList)
+MakefileGenerator::val(const QStringList &varList) const
 {
     return valGlue(varList, "", " ", "");
 }
 
 QString
-MakefileGenerator::varGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after)
+MakefileGenerator::varGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after) const
 {
     return valGlue(project->values(var), before, glue, after);
 }
 
 QString
-MakefileGenerator::fileVarGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after)
+MakefileGenerator::fileVarGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after) const
 {
     ProStringList varList;
     foreach (const ProString &val, project->values(var))
@@ -1453,7 +1453,7 @@ MakefileGenerator::fileVarGlue(const ProKey &var, const QString &before, const Q
 }
 
 QString
-MakefileGenerator::valGlue(const ProStringList &varList, const QString &before, const QString &glue, const QString &after)
+MakefileGenerator::valGlue(const ProStringList &varList, const QString &before, const QString &glue, const QString &after) const
 {
     QString ret;
     for (ProStringList::ConstIterator it = varList.begin(); it != varList.end(); ++it) {
@@ -1467,7 +1467,7 @@ MakefileGenerator::valGlue(const ProStringList &varList, const QString &before,
 }
 
 QString
-MakefileGenerator::valGlue(const QStringList &varList, const QString &before, const QString &glue, const QString &after)
+MakefileGenerator::valGlue(const QStringList &varList, const QString &before, const QString &glue, const QString &after) const
 {
     QString ret;
     for(QStringList::ConstIterator it = varList.begin(); it != varList.end(); ++it) {
@@ -1482,19 +1482,19 @@ MakefileGenerator::valGlue(const QStringList &varList, const QString &before, co
 
 
 QString
-MakefileGenerator::varList(const ProKey &var)
+MakefileGenerator::varList(const ProKey &var) const
 {
     return valList(project->values(var));
 }
 
 QString
-MakefileGenerator::valList(const ProStringList &varList)
+MakefileGenerator::valList(const ProStringList &varList) const
 {
     return valGlue(varList, "", " \\\n\t\t", "");
 }
 
 QString
-MakefileGenerator::valList(const QStringList &varList)
+MakefileGenerator::valList(const QStringList &varList) const
 {
     return valGlue(varList, "", " \\\n\t\t", "");
 }
diff --git a/qmake/generators/makefile.h b/qmake/generators/makefile.h
index 4b8a96c15f0..a382ca6bf6e 100644
--- a/qmake/generators/makefile.h
+++ b/qmake/generators/makefile.h
@@ -225,16 +225,16 @@ protected:
     virtual bool findLibraries();
 
     //for retrieving values and lists of values
-    virtual QString var(const ProKey &var);
-    QString varGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after);
-    QString fileVarGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after);
-    QString varList(const ProKey &var);
-    QString val(const ProStringList &varList);
-    QString val(const QStringList &varList);
-    QString valGlue(const QStringList &varList, const QString &before, const QString &glue, const QString &after);
-    QString valGlue(const ProStringList &varList, const QString &before, const QString &glue, const QString &after);
-    QString valList(const QStringList &varList);
-    QString valList(const ProStringList &varList);
+    virtual QString var(const ProKey &var) const;
+    QString varGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after) const;
+    QString fileVarGlue(const ProKey &var, const QString &before, const QString &glue, const QString &after) const;
+    QString varList(const ProKey &var) const;
+    QString val(const ProStringList &varList) const;
+    QString val(const QStringList &varList) const;
+    QString valGlue(const QStringList &varList, const QString &before, const QString &glue, const QString &after) const;
+    QString valGlue(const ProStringList &varList, const QString &before, const QString &glue, const QString &after) const;
+    QString valList(const QStringList &varList) const;
+    QString valList(const ProStringList &varList) const;
 
     QString filePrefixRoot(const QString &, const QString &);
 
diff --git a/qmake/generators/win32/msvc_nmake.cpp b/qmake/generators/win32/msvc_nmake.cpp
index e742288c357..acccdc1bdc7 100644
--- a/qmake/generators/win32/msvc_nmake.cpp
+++ b/qmake/generators/win32/msvc_nmake.cpp
@@ -303,7 +303,7 @@ void NmakeMakefileGenerator::writeNmakeParts(QTextStream &t)
     }
 }
 
-QString NmakeMakefileGenerator::var(const ProKey &value)
+QString NmakeMakefileGenerator::var(const ProKey &value) const
 {
     if (usePCH) {
         if ((value == "QMAKE_RUN_CXX_IMP_BATCH"
diff --git a/qmake/generators/win32/msvc_nmake.h b/qmake/generators/win32/msvc_nmake.h
index 7a47bb8cec7..4d3c69bdd64 100644
--- a/qmake/generators/win32/msvc_nmake.h
+++ b/qmake/generators/win32/msvc_nmake.h
@@ -62,7 +62,7 @@ protected:
     virtual QString getPdbTarget();
     virtual QString defaultInstall(const QString &t);
     virtual QStringList &findDependencies(const QString &file);
-    QString var(const ProKey &value);
+    QString var(const ProKey &value) const;
     QString precompH, precompObj, precompPch;
     bool usePCH;