diff --git a/src/libs/utils/synchronousprocess.cpp b/src/libs/utils/synchronousprocess.cpp
index 667416a3406..597be2932be 100644
--- a/src/libs/utils/synchronousprocess.cpp
+++ b/src/libs/utils/synchronousprocess.cpp
@@ -37,6 +37,8 @@
 #include <QtCore/QTimer>
 #include <QtCore/QEventLoop>
 #include <QtCore/QTextCodec>
+#include <QtCore/QFileInfo>
+#include <QtCore/QDir>
 
 #include <QtGui/QApplication>
 
@@ -366,5 +368,108 @@ void SynchronousProcess::processStdErr(bool emitSignals)
     }
 }
 
+// Path utilities
+
+enum  OS_Type { OS_Mac, OS_Windows, OS_Unix };
+
+#ifdef Q_OS_WIN
+static const OS_Type pathOS = OS_Windows;
+#else
+#  ifdef Q_OS_MAC
+static const OS_Type pathOS = OS_Mac;
+#  else
+static const OS_Type pathOS = OS_Unix;
+#  endif
+#endif
+
+// Locate a binary in a directory, applying all kinds of
+// extensions the operating system supports.
+static QString checkBinary(const QDir &dir, const QString &binary)
+{
+    // naive UNIX approach
+    const QFileInfo info(dir.filePath(binary));
+    if (info.isFile() && info.isExecutable())
+        return info.absoluteFilePath();
+
+    // Does the OS have some weird extension concept or does the
+    // binary have a 3 letter extension?
+    if (pathOS == OS_Unix)
+        return QString();
+    const int dotIndex = binary.lastIndexOf(QLatin1Char('.'));
+    if (dotIndex != -1 && dotIndex == binary.size() - 4)
+        return  QString();
+
+    switch (pathOS) {
+    case OS_Unix:
+        break;
+    case OS_Windows: {
+            static const char *windowsExtensions[] = {".cmd", ".bat", ".exe", ".com" };
+            // Check the Windows extensions using the order
+            const int windowsExtensionCount = sizeof(windowsExtensions)/sizeof(const char*);
+            for (int e = 0; e < windowsExtensionCount; e ++) {
+                const QFileInfo windowsBinary(dir.filePath(binary + QLatin1String(windowsExtensions[e])));
+                if (windowsBinary.isFile() && windowsBinary.isExecutable())
+                    return windowsBinary.absoluteFilePath();
+            }
+        }
+        break;
+    case OS_Mac: {
+            // Check for Mac app folders
+            const QFileInfo appFolder(dir.filePath(binary + QLatin1String(".app")));
+            if (appFolder.isDir()) {
+                QString macBinaryPath = appFolder.absoluteFilePath();
+                macBinaryPath += QLatin1String("/Contents/MacOS/");
+                macBinaryPath += binary;
+                const QFileInfo macBinary(macBinaryPath);
+                if (macBinary.isFile() && macBinary.isExecutable())
+                    return macBinary.absoluteFilePath();
+            }
+        }
+        break;
+    }
+    return QString();
+}
+
+QString SynchronousProcess::locateBinary(const QString &path, const QString &binary)
+{
+    // Absolute file?
+    const QFileInfo absInfo(binary);
+    if (absInfo.isAbsolute())
+        return checkBinary(absInfo.dir(), absInfo.fileName());
+
+    // Windows finds binaries  in the current directory
+    if (pathOS == OS_Windows) {
+        const QString currentDirBinary = checkBinary(QDir::current(), binary);
+        if (!currentDirBinary.isEmpty())
+            return currentDirBinary;
+    }
+
+    const QStringList paths = path.split(pathSeparator());
+    if (paths.empty())
+        return QString();
+    const QStringList::const_iterator cend = paths.constEnd();
+    for (QStringList::const_iterator it = paths.constBegin(); it != cend; ++it) {
+        const QDir dir(*it);
+        const QString rc = checkBinary(dir, binary);
+        if (!rc.isEmpty())
+            return rc;
+    }
+    return QString();
+}
+
+QString SynchronousProcess::locateBinary(const QString &binary)
+{
+    const QByteArray path = qgetenv("PATH");
+    return locateBinary(QString::fromLocal8Bit(path), binary);
+}
+
+QChar SynchronousProcess::pathSeparator()
+{
+    if (pathOS == OS_Windows)
+        return QLatin1Char(';');
+    return QLatin1Char(':');
+}
+
+
 } // namespace Utils
 } // namespace Core
diff --git a/src/libs/utils/synchronousprocess.h b/src/libs/utils/synchronousprocess.h
index e9218f43d80..80a04a1303e 100644
--- a/src/libs/utils/synchronousprocess.h
+++ b/src/libs/utils/synchronousprocess.h
@@ -114,6 +114,12 @@ public:
 
     SynchronousProcessResponse run(const QString &binary, const QStringList &args);
 
+    // Helpers to find binaries. Do not use it for other path variables
+    // and file types.
+    static QString locateBinary(const QString &binary);
+    static QString locateBinary(const QString &path, const QString &binary);
+    static QChar pathSeparator();
+
 signals:
     void stdOut(const QByteArray &data, bool firstTime);
     void stdErr(const QByteArray &data, bool firstTime);
diff --git a/src/plugins/git/gitclient.cpp b/src/plugins/git/gitclient.cpp
index 87f06931200..a3ad3ba84ff 100644
--- a/src/plugins/git/gitclient.cpp
+++ b/src/plugins/git/gitclient.cpp
@@ -102,8 +102,10 @@ GitClient::GitClient(GitPlugin* plugin)
     m_plugin(plugin),
     m_core(Core::ICore::instance())
 {
-    if (QSettings *s = m_core->settings())
+    if (QSettings *s = m_core->settings()) {
         m_settings.fromSettings(s);
+        m_binaryPath = m_settings.gitBinaryPath();
+    }
 }
 
 GitClient::~GitClient()
@@ -478,7 +480,7 @@ GitCommand *GitClient::createCommand(const QString &workingDirectory,
     if (m_settings.adoptPath)
         environment.set(QLatin1String("PATH"), m_settings.path);
 
-    GitCommand* command = new GitCommand(workingDirectory, environment);
+    GitCommand* command = new GitCommand(m_binaryPath, workingDirectory, environment);
     if (outputToWindow) {
         if (!editor) { // assume that the commands output is the important thing
             connect(command, SIGNAL(outputData(QByteArray)), this, SLOT(appendDataAndPopup(QByteArray)));
@@ -527,10 +529,9 @@ bool GitClient::synchronousGit(const QString &workingDirectory,
 {
     if (Git::Constants::debug)
         qDebug() << "synchronousGit" << workingDirectory << arguments;
-    const QString binary = QLatin1String(Constants::GIT_BINARY);
 
     if (logCommandToWindow)
-        m_plugin->outputWindow()->append(formatCommand(binary, arguments));
+        m_plugin->outputWindow()->append(formatCommand(m_binaryPath, arguments));
 
     QProcess process;
     process.setWorkingDirectory(workingDirectory);
@@ -540,7 +541,7 @@ bool GitClient::synchronousGit(const QString &workingDirectory,
         environment.set(QLatin1String("PATH"), m_settings.path);
     process.setEnvironment(environment.toStringList());
 
-    process.start(binary, arguments);
+    process.start(m_binaryPath, arguments);
     if (!process.waitForFinished()) {
         if (errorText)
             *errorText = "Error: Git timed out";
@@ -1000,6 +1001,6 @@ void GitClient::setSettings(const GitSettings &s)
         m_settings = s;
         if (QSettings *s = m_core->settings())
             m_settings.toSettings(s);
+        m_binaryPath = m_settings.gitBinaryPath();
     }
 }
-
diff --git a/src/plugins/git/gitclient.h b/src/plugins/git/gitclient.h
index c920ffc1b32..edd7e05c9e3 100644
--- a/src/plugins/git/gitclient.h
+++ b/src/plugins/git/gitclient.h
@@ -176,6 +176,7 @@ private:
     GitPlugin     *m_plugin;
     Core::ICore   *m_core;
     GitSettings   m_settings;
+    QString m_binaryPath;
 };
 
 
diff --git a/src/plugins/git/gitcommand.cpp b/src/plugins/git/gitcommand.cpp
index 8362926cecc..54bfcea2ab4 100644
--- a/src/plugins/git/gitcommand.cpp
+++ b/src/plugins/git/gitcommand.cpp
@@ -61,8 +61,10 @@ GitCommand::Job::Job(const QStringList &a, int t) :
 {
 }
 
-GitCommand::GitCommand(const QString &workingDirectory,
+GitCommand::GitCommand(const QString &binaryPath,
+                       const QString &workingDirectory,
                         ProjectExplorer::Environment &environment)  :
+    m_binaryPath(binaryPath),
     m_workingDirectory(workingDirectory),
     m_environment(environmentToList(environment))
 {
@@ -109,7 +111,7 @@ void GitCommand::run()
         if (Git::Constants::debug)
             qDebug() << "GitCommand::run" << j << '/' << count << m_jobs.at(j).arguments;
 
-        process.start(QLatin1String(Constants::GIT_BINARY), m_jobs.at(j).arguments);
+        process.start(m_binaryPath, m_jobs.at(j).arguments);
         if (!process.waitForFinished(m_jobs.at(j).timeout * 1000)) {
             ok = false;
             error += QLatin1String("Error: Git timed out");
diff --git a/src/plugins/git/gitcommand.h b/src/plugins/git/gitcommand.h
index 32b76bf3485..1d661706151 100644
--- a/src/plugins/git/gitcommand.h
+++ b/src/plugins/git/gitcommand.h
@@ -43,9 +43,11 @@ namespace Internal {
 
 class GitCommand : public QObject
 {
+    Q_DISABLE_COPY(GitCommand)
     Q_OBJECT
 public:
-    explicit GitCommand(const QString &workingDirectory,
+    explicit GitCommand(const QString &binaryPath,
+                        const QString &workingDirectory,
                         ProjectExplorer::Environment &environment);
 
 
@@ -67,8 +69,7 @@ private:
         int timeout;
     };
 
-    QStringList environment() const;
-
+    const QString m_binaryPath;
     const QString m_workingDirectory;
     const QStringList m_environment;
 
diff --git a/src/plugins/git/gitsettings.cpp b/src/plugins/git/gitsettings.cpp
index 02a1acc1d9e..c379bb3fba5 100644
--- a/src/plugins/git/gitsettings.cpp
+++ b/src/plugins/git/gitsettings.cpp
@@ -32,9 +32,13 @@
 ***************************************************************************/
 
 #include "gitsettings.h"
+#include "gitconstants.h"
+
+#include <utils/synchronousprocess.h>
 
 #include <QtCore/QSettings>
 #include <QtCore/QTextStream>
+#include <QtCore/QCoreApplication>
 
 static const char *groupC = "Git";
 static const char *sysEnvKeyC = "SysEnv";
@@ -79,5 +83,30 @@ bool GitSettings::equals(const GitSettings &s) const
     return adoptPath == s.adoptPath && path == s.path && logCount == s.logCount && timeout == s.timeout;
 }
 
+QString GitSettings::gitBinaryPath(bool *ok, QString *errorMessage) const
+{
+    // Locate binary in path if one is specified, otherwise default
+    // to pathless binary
+    if (ok)
+        *ok = true;
+    if (errorMessage)
+        errorMessage->clear();
+    const QString binary = QLatin1String(Constants::GIT_BINARY);
+    // Easy, git is assumed to be elsewhere accessible
+    if (!adoptPath)
+        return binary;
+    // Search in path?
+    const QString pathBinary = Core::Utils::SynchronousProcess::locateBinary(path, binary);
+    if (pathBinary.isEmpty()) {
+        if (ok)
+            *ok = false;
+        if (errorMessage)
+            *errorMessage = QCoreApplication::translate("GitSettings",
+                                                        "The binary '%1' could not be located in the path '%2'").arg(binary, path);
+        return binary;
+    }
+    return pathBinary;
+}
+
 }
 }
diff --git a/src/plugins/git/gitsettings.h b/src/plugins/git/gitsettings.h
index c2463eb326d..05dc250c578 100644
--- a/src/plugins/git/gitsettings.h
+++ b/src/plugins/git/gitsettings.h
@@ -51,6 +51,8 @@ struct GitSettings
     void fromSettings(QSettings *);
     void toSettings(QSettings *) const;
 
+    QString gitBinaryPath(bool *ok = 0, QString *errorMessage = 0) const;
+
     bool equals(const GitSettings &s) const;
 
     bool adoptPath;
diff --git a/src/plugins/git/settingspage.cpp b/src/plugins/git/settingspage.cpp
index 121c7cd889b..4fdd672eac4 100644
--- a/src/plugins/git/settingspage.cpp
+++ b/src/plugins/git/settingspage.cpp
@@ -36,8 +36,10 @@
 #include "gitplugin.h"
 
 #include <QtCore/QDebug>
+#include <QtGui/QMessageBox>
 
-using namespace Git::Internal;
+namespace Git {
+namespace Internal {
 
 SettingsPageWidget::SettingsPageWidget(QWidget *parent) :
     QWidget(parent)
@@ -101,6 +103,17 @@ void SettingsPage::apply()
 {
     if (!m_widget)
         return;
+    const GitSettings newSettings = m_widget->settings();
+    // Warn if git cannot be found in path if the widget is on top
+    if (m_widget->isVisible()) {
+        bool gitFoundOk;
+        QString errorMessage;
+        newSettings.gitBinaryPath(&gitFoundOk, &errorMessage);
+        if (!gitFoundOk)
+            QMessageBox::warning(m_widget, tr("Git Settings"), errorMessage);
+    }
 
-    GitPlugin::instance()->setSettings(m_widget->settings());
+    GitPlugin::instance()->setSettings(newSettings);
+}
+}
 }
diff --git a/src/shared/cplusplus/ASTVisitor.cpp b/src/shared/cplusplus/ASTVisitor.cpp
index 7b9ca1ed7fa..d08d1c4d93d 100644
--- a/src/shared/cplusplus/ASTVisitor.cpp
+++ b/src/shared/cplusplus/ASTVisitor.cpp
@@ -77,12 +77,7 @@ int ASTVisitor::tokenKind(unsigned index) const
 { return translationUnit()->tokenKind(index); }
 
 const char *ASTVisitor::spell(unsigned index) const
-{
-    if (! index)
-        return 0;
-
-    return translationUnit()->tokenAt(index).spell();
-}
+{ return translationUnit()->spell(index); }
 
 Identifier *ASTVisitor::identifier(unsigned index) const
 { return translationUnit()->identifier(index); }
diff --git a/src/shared/cplusplus/CheckDeclaration.cpp b/src/shared/cplusplus/CheckDeclaration.cpp
index f8ddde8b48e..038583c27d4 100644
--- a/src/shared/cplusplus/CheckDeclaration.cpp
+++ b/src/shared/cplusplus/CheckDeclaration.cpp
@@ -389,6 +389,11 @@ bool CheckDeclaration::visit(UsingDirectiveAST *ast)
     UsingNamespaceDirective *u = control()->newUsingNamespaceDirective(ast->firstToken(), name);
     ast->symbol = u;
     _scope->enterSymbol(u);
+
+    if (! (_scope->isBlockScope() || _scope->isNamespaceScope()))
+        translationUnit()->error(ast->firstToken(),
+                                 "using-directive not within namespace or block scope");
+
     return false;
 }
 
diff --git a/src/shared/cplusplus/TranslationUnit.cpp b/src/shared/cplusplus/TranslationUnit.cpp
index 40a95c0f05d..ebadf35c75a 100644
--- a/src/shared/cplusplus/TranslationUnit.cpp
+++ b/src/shared/cplusplus/TranslationUnit.cpp
@@ -134,6 +134,14 @@ const Token &TranslationUnit::tokenAt(unsigned index) const
 int TranslationUnit::tokenKind(unsigned index) const
 { return _tokens->at(index).kind; }
 
+const char *TranslationUnit::spell(unsigned index) const
+{
+    if (! index)
+        return 0;
+
+    return _tokens->at(index).spell();
+}
+
 Identifier *TranslationUnit::identifier(unsigned index) const
 { return _tokens->at(index).identifier; }
 
diff --git a/src/shared/cplusplus/TranslationUnit.h b/src/shared/cplusplus/TranslationUnit.h
index aa490701ef9..7a57950ac34 100644
--- a/src/shared/cplusplus/TranslationUnit.h
+++ b/src/shared/cplusplus/TranslationUnit.h
@@ -87,6 +87,7 @@ public:
     unsigned tokenCount() const;
     const Token &tokenAt(unsigned index) const;
     int tokenKind(unsigned index) const;
+    const char *spell(unsigned index) const;
 
     unsigned matchingBrace(unsigned index) const;
     Identifier *identifier(unsigned index) const;
diff --git a/tests/manual/binding/main.cpp b/tests/manual/binding/main.cpp
index 8e889b6b514..5c3545339e1 100644
--- a/tests/manual/binding/main.cpp
+++ b/tests/manual/binding/main.cpp
@@ -43,6 +43,8 @@
 #include <Symbols.h>
 #include <Literals.h>
 
+#include <vector>
+
 #include <cstdio>
 #include <cstdlib>
 #include <cassert>
@@ -55,6 +57,40 @@
 // NamespaceBinding
 ////////////////////////////////////////////////////////////////////////////////
 
+class Location
+{
+public:
+    Location()
+        : _fileId(0),
+          _sourceLocation(0)
+    { }
+
+    Location(Symbol *symbol)
+        : _fileId(symbol->fileId()),
+          _sourceLocation(symbol->sourceLocation())
+    { }
+
+    Location(StringLiteral *fileId, unsigned sourceLocation)
+        : _fileId(fileId), _sourceLocation(sourceLocation)
+    { }
+
+    inline bool isValid() const
+    { return _fileId != 0; }
+
+    inline operator bool() const
+    { return _fileId != 0; }
+
+    inline StringLiteral *fileId() const
+    { return _fileId; }
+
+    inline unsigned sourceLocation() const
+    { return _sourceLocation; }
+
+private:
+    StringLiteral *_fileId;
+    unsigned _sourceLocation;
+};
+
 class NamespaceBinding
 {
 public:
@@ -79,6 +115,10 @@ public:
     /// Returns the binding associated with the given symbol.
     NamespaceBinding *findOrCreateNamespaceBinding(Namespace *symbol);
 
+    NamespaceBinding *resolveNamespace(const Location &loc,
+                                       Name *name,
+                                       bool lookAtParent = true);
+
     /// Helpers.
     std::string qualifiedId() const;
     void dump();
@@ -96,6 +136,9 @@ public: // attributes
     /// This binding's connections.
     Array<NamespaceBinding *> children;
 
+    /// This binding's list of using namespaces.
+    Array<NamespaceBinding *> usings;
+
     /// This binding's namespace symbols.
     Array<Namespace *> symbols;
 };
@@ -211,6 +254,104 @@ NamespaceBinding *NamespaceBinding::findOrCreateNamespaceBinding(Namespace *symb
     return binding;
 }
 
+static void closure(const Location &loc,
+                    NamespaceBinding *binding, Name *name,
+                    Array<NamespaceBinding *> *bindings)
+{
+    for (unsigned i = 0; i < bindings->size(); ++i) {
+        NamespaceBinding *b = bindings->at(i);
+
+        if (b == binding)
+            return;
+    }
+
+    bindings->push_back(binding);
+
+    assert(name->isNameId());
+
+    Identifier *id = name->asNameId()->identifier();
+    bool ignoreUsingDirectives = false;
+
+    for (unsigned i = 0; i < binding->symbols.size(); ++i) {
+        Namespace *symbol = binding->symbols.at(i);
+        Scope *scope = symbol->members();
+
+        for (Symbol *symbol = scope->lookat(id); symbol; symbol = symbol->next()) {
+            if (symbol->name() != name || ! symbol->isNamespace())
+                continue;
+
+            const Location l(symbol);
+
+            if (l.fileId() == loc.fileId() && l.sourceLocation() < loc.sourceLocation()) {
+                ignoreUsingDirectives = true;
+                break;
+            }
+        }
+    }
+
+    if (ignoreUsingDirectives)
+        return;
+
+    for (unsigned i = 0; i < binding->usings.size(); ++i) {
+        NamespaceBinding *u = binding->usings.at(i);
+
+        closure(loc, u, name, bindings);
+    }
+}
+
+
+NamespaceBinding *NamespaceBinding::resolveNamespace(const Location &loc,
+                                                     Name *name,
+                                                     bool lookAtParent)
+{
+    if (! name)
+        return 0;
+
+    else if (NameId *nameId = name->asNameId()) {
+        Array<NamespaceBinding *> bindings;
+        closure(loc, this, nameId, &bindings);
+
+        Array<NamespaceBinding *> results;
+
+        for (unsigned i = 0; i < bindings.size(); ++i) {
+            NamespaceBinding *binding = bindings.at(i);
+
+            if (NamespaceBinding *b = binding->findNamespaceBinding(nameId))
+                results.push_back(b);
+        }
+
+        if (results.size() == 1)
+            return results.at(0);
+
+        else if (results.size() > 1) {
+            // ### FIXME: return 0;
+            return results.at(0);
+        }
+
+        else if (parent && lookAtParent)
+            return parent->resolveNamespace(loc, name);
+
+    } else if (QualifiedNameId *q = name->asQualifiedNameId()) {
+        if (q->nameCount() == 1) {
+            assert(q->isGlobal());
+
+            return globalNamespaceBinding()->resolveNamespace(loc, q->nameAt(0));
+        }
+
+        NamespaceBinding *current = this;
+        if (q->isGlobal())
+            current = globalNamespaceBinding();
+
+        current = current->resolveNamespace(loc, q->nameAt(0));
+        for (unsigned i = 1; current && i < q->nameCount(); ++i)
+            current = current->resolveNamespace(loc, q->nameAt(i), false);
+
+        return current;
+    }
+
+    return 0;
+}
+
 // ### rewrite me
 std::string NamespaceBinding::qualifiedId() const
 {
@@ -255,28 +396,38 @@ public:
     Binder();
     virtual ~Binder();
 
-    NamespaceBinding *operator()(Symbol *symbol)
-    { return bind(symbol, 0); }
+    NamespaceBinding *operator()(TranslationUnit *u, Namespace *globals)
+    {
+        TranslationUnit *previousUnit = unit;
+        unit = u;
+        NamespaceBinding *binding = bind(globals, 0);
+        unit = previousUnit;
+        return binding;
+    }
 
 protected:
     NamespaceBinding *bind(Symbol *symbol, NamespaceBinding *binding);
     NamespaceBinding *findOrCreateNamespaceBinding(Namespace *symbol);
+    NamespaceBinding *resolveNamespace(const Location &loc, Name *name);
 
     NamespaceBinding *switchNamespaceBinding(NamespaceBinding *binding);
 
     using SymbolVisitor::visit;
 
     virtual bool visit(Namespace *);
+    virtual bool visit(UsingNamespaceDirective *);
     virtual bool visit(Class *);
     virtual bool visit(Function *);
     virtual bool visit(Block *);
 
 private:
     NamespaceBinding *namespaceBinding;
+    TranslationUnit *unit;
 };
 
 Binder::Binder()
-    : namespaceBinding(0)
+    : namespaceBinding(0),
+      unit(0)
 { }
 
 Binder::~Binder()
@@ -299,6 +450,15 @@ NamespaceBinding *Binder::findOrCreateNamespaceBinding(Namespace *symbol)
     return namespaceBinding;
 }
 
+NamespaceBinding *Binder::resolveNamespace(const Location &loc, Name *name)
+{
+    if (! namespaceBinding)
+        return 0;
+
+    return namespaceBinding->resolveNamespace(loc, name);
+}
+
+
 NamespaceBinding *Binder::switchNamespaceBinding(NamespaceBinding *binding)
 {
     NamespaceBinding *previousBinding = namespaceBinding;
@@ -319,6 +479,20 @@ bool Binder::visit(Namespace *symbol)
     return false;
 }
 
+bool Binder::visit(UsingNamespaceDirective *u)
+{
+    NamespaceBinding *resolved = resolveNamespace(Location(u), u->name());
+
+    if (! resolved) {
+        unit->error(u->sourceLocation(), "expected namespace-name");
+        return false;
+    }
+
+    namespaceBinding->usings.push_back(resolved);
+
+    return false;
+}
+
 bool Binder::visit(Class *)
 { return false; }
 
@@ -376,7 +550,7 @@ int main(int argc, char *argv[])
 
     // bind
     Binder bind;
-    NamespaceBinding *binding = bind(globalNamespace);
+    NamespaceBinding *binding = bind(&unit, globalNamespace);
     binding->dump();
     delete binding;