diff --git a/README.md b/README.md
index 030cf7a..8c2e953 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,11 @@
 
 Daniel Jost maintains a dub package on [chocolatey](https://chocolatey.org/packages/dub). Use `cinst dub` or `cinst dub -version #.#.#` to install stable or a custom version respectively.
 
+## Alpine Linux
+
+Mathias (@Geod24) Lang maintains the Alpine Linux packages.
+It is currently part of 'edge' and can be installed through `apk --no-cache add -X http://dl-cdn.alpinelinux.org/alpine/edge/testing dub`.
+
 ## Using DUB as a library
 
 The [DUB package of DUB](http://code.dlang.org/packages/dub) can be used as a library to load or manipulate packages, or to resemble any functionality of the command line tool. The former task can be achieved by using the [Package class](https://github.com/dlang/dub/blob/master/source/dub/package_.d#L40). For examples on how to replicate the command line functionality, see [commandline.d](https://github.com/dlang/dub/blob/master/source/dub/commandline.d).
diff --git a/source/dub/dependency.d b/source/dub/dependency.d
index da551b5..f16edcc 100644
--- a/source/dub/dependency.d
+++ b/source/dub/dependency.d
@@ -143,7 +143,6 @@
 		static import std.string;
 
 		enforce(ves.length > 0);
-		string orig = ves;
 
 		if (ves == ANY_IDENT) {
 			// Any version is good.
diff --git a/source/dub/dub.d b/source/dub/dub.d
index 3f0d9ca..e1406c8 100644
--- a/source/dub/dub.d
+++ b/source/dub/dub.d
@@ -33,7 +33,7 @@
 import std.encoding : sanitize;
 
 // Set output path and options for coverage reports
-version (DigitalMars) version (D_Coverage) static if (__VERSION__ >= 2068)
+version (DigitalMars) version (D_Coverage)
 {
 	shared static this()
 	{
@@ -59,7 +59,7 @@
 deprecated("use defaultRegistryURLs") enum defaultRegistryURL = defaultRegistryURLs[0];
 
 /// The URL to the official package registry and it's default fallback registries.
-enum defaultRegistryURLs = [
+static immutable string[] defaultRegistryURLs = [
 	"https://code.dlang.org/",
 	"https://code-mirror.dlang.io/",
 	"https://dub-registry.herokuapp.com/",
@@ -1201,7 +1201,6 @@
 		enforce(!vers.empty, "Failed to find any valid versions for a package name of '"~package_name~"'.");
 		auto final_versions = vers.filter!(v => !v.isBranch && !v.isPreRelease).array;
 		if (prefer_stable && final_versions.length) return final_versions[$-1];
-		else if (vers[$-1].isBranch) return vers[$-1];
 		else return vers[$-1];
 	}
 
diff --git a/source/dub/generators/build.d b/source/dub/generators/build.d
index 88722d2..5a92dbf 100644
--- a/source/dub/generators/build.d
+++ b/source/dub/generators/build.d
@@ -48,8 +48,6 @@
 	{
 		scope (exit) cleanupTemporaries();
 
-		auto dcl = settings.compiler;
-
 		void checkPkgRequirements(const(Package) pkg)
 		{
 			const tr = pkg.recipe.toolchainRequirements;
@@ -86,7 +84,6 @@
 			NativePath[] additional_dep_files;
 			auto bs = ti.buildSettings.dup;
 			foreach (ldep; ti.linkDependencies) {
-				auto dbs = targets[ldep].buildSettings;
 				if (bs.targetType != TargetType.staticLibrary && !(bs.options & BuildOption.syntaxOnly)) {
 					bs.addSourceFiles(target_paths[ldep].toNativeString());
 				} else {
@@ -194,9 +191,6 @@
 			return false;
 		}
 
-		// determine basic build properties
-		auto generate_binary = !(buildsettings.options & BuildOption.syntaxOnly);
-
 		logInfo("%s %s: building configuration \"%s\"...", pack.name, pack.version_, config);
 
 		if( buildsettings.preBuildCommands.length ){
@@ -284,9 +278,7 @@
 	private void performDirectBuild(GeneratorSettings settings, ref BuildSettings buildsettings, in Package pack, string config, out NativePath target_path)
 	{
 		auto cwd = NativePath(getcwd());
-
 		auto generate_binary = !(buildsettings.options & BuildOption.syntaxOnly);
-		auto is_static_library = buildsettings.targetType == TargetType.staticLibrary || buildsettings.targetType == TargetType.library;
 
 		// make file paths relative to shrink the command line
 		foreach (ref f; buildsettings.sourceFiles) {
@@ -450,7 +442,6 @@
 		auto generate_binary = !(buildsettings.options & BuildOption.syntaxOnly);
 		auto is_static_library = buildsettings.targetType == TargetType.staticLibrary || buildsettings.targetType == TargetType.library;
 
-		NativePath target_file;
 		scope (failure) {
 			logDiagnostic("FAIL %s %s %s" , buildsettings.targetPath, buildsettings.targetName, buildsettings.targetType);
 			auto tpath = getTargetPath(buildsettings, settings);
@@ -644,8 +635,6 @@
 		}
 	}
 
-	auto comp = new TestCompiler;
-
 	GeneratorSettings settings;
 	settings.platform = BuildPlatform(determinePlatform(), ["x86"], "gdc", "test", 2075);
 	settings.compiler = new TestCompiler;
diff --git a/source/dub/generators/generator.d b/source/dub/generators/generator.d
index dca03da..48e10ec 100644
--- a/source/dub/generators/generator.d
+++ b/source/dub/generators/generator.d
@@ -305,10 +305,7 @@
 		}
 
 		collectDependencies(rootPackage, *roottarget, targets);
-		static if (__VERSION__ > 2070)
-			visited.clear();
-		else
-			destroy(visited);
+		visited.clear();
 
 		// 1. downwards inherits versions, debugVersions, and inheritable build settings
 		static void configureDependencies(in ref TargetInfo ti, TargetInfo[string] targets, size_t level = 0)
@@ -360,10 +357,7 @@
 		}
 
 		configureDependents(*roottarget, targets);
-		static if (__VERSION__ > 2070)
-			visited.clear();
-		else
-			destroy(visited);
+		visited.clear();
 
 		// 4. Filter applicable version and debug version identifiers
 		if (genSettings.filterVersions)
diff --git a/source/dub/generators/sublimetext.d b/source/dub/generators/sublimetext.d
index 9ac53c9..1bf2187 100644
--- a/source/dub/generators/sublimetext.d
+++ b/source/dub/generators/sublimetext.d
@@ -67,7 +67,7 @@
 
 private Json buildSystems(BuildPlatform buildPlatform, string workingDiretory = getcwd())
 {
-	enum BUILD_TYPES = [
+	static immutable BUILD_TYPES = [
 		//"plain",
 		"debug",
 		"release",
diff --git a/source/dub/generators/visuald.d b/source/dub/generators/visuald.d
index aa8bc59..13ab9a3 100644
--- a/source/dub/generators/visuald.d
+++ b/source/dub/generators/visuald.d
@@ -104,7 +104,6 @@
 
 			const string[] sub = ["ActiveCfg", "Build.0"];
 			const string[] conf = [settings.buildType~"|"~settings.platform.architecture[0].vsArchitecture];
-			auto projectUuid = guid(mainpack);
 			foreach (t; targets.byKey)
 				foreach (c; conf)
 					foreach (s; sub)
@@ -155,7 +154,6 @@
 		{
 			import dub.compilers.utils : isLinkerFile;
 
-			int i = 0;
 			auto ret = appender!(char[])();
 
 			auto project_file_dir = m_project.rootPackage.path ~ projFileName(packname).parentPath;
diff --git a/source/dub/init.d b/source/dub/init.d
index 98c98c4..da068fc 100644
--- a/source/dub/init.d
+++ b/source/dub/init.d
@@ -145,7 +145,6 @@
 {
 	import dub.compilers.buildsettings : TargetType;
 
-	auto name = root_path.head.toString().toLower();
 	p.description = format("Deimos Bindings for "~p.name~".");
 	p.buildSettings.importPaths[""] ~= ".";
 	p.buildSettings.targetType = TargetType.sourceLibrary;
diff --git a/source/dub/internal/utils.d b/source/dub/internal/utils.d
index 5879e79..043812d 100644
--- a/source/dub/internal/utils.d
+++ b/source/dub/internal/utils.d
@@ -26,7 +26,7 @@
 version(DubUseCurl)
 {
 	import std.net.curl;
-	static if (__VERSION__ > 2075) public import std.net.curl : HTTPStatusException;
+	public import std.net.curl : HTTPStatusException;
 }
 
 
@@ -105,12 +105,6 @@
 	}
 }
 
-bool isEmptyDir(NativePath p) {
-	foreach(DirEntry e; dirEntries(p.toNativeString(), SpanMode.shallow))
-		return false;
-	return true;
-}
-
 bool isWritableDir(NativePath p, bool create_if_missing = false)
 {
 	import std.random;
@@ -163,17 +157,6 @@
 	throw new Exception("No package descriptor found");
 }
 
-Json jsonFromZip(NativePath zip, string filename) {
-	import std.zip : ZipArchive;
-	auto f = openFile(zip, FileMode.read);
-	ubyte[] b = new ubyte[cast(size_t)f.size];
-	f.rawRead(b);
-	f.close();
-	auto archive = new ZipArchive(b);
-	auto text = stripUTF8Bom(cast(string)archive.expand(archive.directory[filename]));
-	return parseJsonString(text, zip.toNativeString~"/"~filename);
-}
-
 void writeJsonFile(NativePath path, Json json)
 {
 	auto f = openFile(path, FileMode.createTrunc);
@@ -197,11 +180,6 @@
 	moveFile(tmppath, path);
 }
 
-bool isPathFromZip(string p) {
-	enforce(p.length > 0);
-	return p[$-1] == '/';
-}
-
 bool existsDirectory(NativePath path) {
 	if( !existsFile(path) ) return false;
 	auto fi = getFileInfo(path);
@@ -242,37 +220,8 @@
 	}
 }
 
-version(DubUseCurl) {
-	/++
-	 Exception thrown on HTTP request failures, e.g. 404 Not Found.
-	 +/
-	static if (__VERSION__ <= 2075) class HTTPStatusException : CurlException
-	{
-		/++
-		 Params:
-		 status = The HTTP status code.
-		 msg  = The message for the exception.
-		 file = The file where the exception occurred.
-		 line = The line number where the exception occurred.
-		 next = The previous exception in the chain of exceptions, if any.
-		 +/
-		@safe pure nothrow
-			this(
-				int status,
-				string msg,
-				string file = __FILE__,
-				size_t line = __LINE__,
-				Throwable next = null)
-		{
-			this.status = status;
-			super(msg, file, line, next);
-		}
-
-		int status; /// The HTTP status code
-	}
-} else version (Have_vibe_d_http) {
+version (Have_vibe_d_http)
 	public import vibe.http.common : HTTPStatusException;
-}
 
 /**
 	Downloads a file from the specified URL.
@@ -293,27 +242,13 @@
 		auto conn = HTTP();
 		setupHTTPClient(conn, timeout);
 		logDebug("Storing %s...", url);
-		static if (__VERSION__ <= 2075)
-		{
-			try
-				std.net.curl.download(url, filename, conn);
-			catch (CurlException e)
-			{
-				if (e.msg.canFind("404"))
-					throw new HTTPStatusException(404, e.msg);
-				throw e;
-			}
-		}
-		else
-		{
-			std.net.curl.download(url, filename, conn);
-			// workaround https://issues.dlang.org/show_bug.cgi?id=18318
-			auto sl = conn.statusLine;
-			logDebug("Download %s %s", url, sl);
-			if (sl.code / 100 != 2)
-				throw new HTTPStatusException(sl.code,
-					"Downloading %s failed with %d (%s).".format(url, sl.code, sl.reason));
-		}
+		std.net.curl.download(url, filename, conn);
+		// workaround https://issues.dlang.org/show_bug.cgi?id=18318
+		auto sl = conn.statusLine;
+		logDebug("Download %s %s", url, sl);
+		if (sl.code / 100 != 2)
+			throw new HTTPStatusException(sl.code,
+				"Downloading %s failed with %d (%s).".format(url, sl.code, sl.reason));
 	} else version (Have_vibe_d_http) {
 		import vibe.inet.urltransfer;
 		vibe.inet.urltransfer.download(url, filename);
@@ -331,19 +266,7 @@
 		auto conn = HTTP();
 		setupHTTPClient(conn, timeout);
 		logDebug("Getting %s...", url);
-		static if (__VERSION__ <= 2075)
-		{
-			try
-				return cast(ubyte[])get(url, conn);
-			catch (CurlException e)
-			{
-				if (e.msg.canFind("404"))
-					throw new HTTPStatusException(404, e.msg);
-				throw e;
-			}
-		}
-		else
-			return cast(ubyte[])get(url, conn);
+		return cast(ubyte[])get(url, conn);
 	} else version (Have_vibe_d_http) {
 		import vibe.inet.urltransfer;
 		import vibe.stream.operations;
diff --git a/source/dub/internal/vibecompat/data/utils.d b/source/dub/internal/vibecompat/data/utils.d
index a967455..ace6a76 100644
--- a/source/dub/internal/vibecompat/data/utils.d
+++ b/source/dub/internal/vibecompat/data/utils.d
@@ -215,8 +215,8 @@
 		ref int someTempl()() { return i; }
 	}
 
-	enum plainFields = ["i"];
-	enum fields = ["i", "p1", "p4", "p5"];
+	immutable plainFields = ["i"];
+	immutable fields = ["i", "p1", "p4", "p5"];
 
 	foreach (mem; __traits(allMembers, S)) {
 		static if (isRWField!(S, mem)) static assert(fields.canFind(mem), mem~" detected as field.");
diff --git a/source/dub/internal/vibecompat/inet/path.d b/source/dub/internal/vibecompat/inet/path.d
index 4ad987e..c25878a 100644
--- a/source/dub/internal/vibecompat/inet/path.d
+++ b/source/dub/internal/vibecompat/inet/path.d
@@ -221,7 +221,6 @@
 		ret.normalize(); // needed to avoid "."~".." become "" instead of ".."
 
 		assert(!rhs.absolute, "Trying to append absolute path.");
-		size_t idx = m_nodes.length;
 		foreach(folder; rhs.m_nodes){
 			switch(folder.toString()){
 				default: ret.m_nodes = ret.m_nodes ~ folder; break;
diff --git a/source/dub/packagemanager.d b/source/dub/packagemanager.d
index 13134b5..08a02d0 100644
--- a/source/dub/packagemanager.d
+++ b/source/dub/packagemanager.d
@@ -362,7 +362,6 @@
 
 		auto package_name = package_info["name"].get!string;
 		auto package_version = package_info["version"].get!string;
-		auto clean_package_version = package_version[package_version.startsWith("~") ? 1 : 0 .. $];
 
 		logDebug("Placing package '%s' version '%s' to location '%s' from file '%s'",
 			package_name, package_version, destination.toNativeString(), zip_file_path.toNativeString());
diff --git a/source/dub/recipe/json.d b/source/dub/recipe/json.d
index 354a1e6..791d485 100644
--- a/source/dub/recipe/json.d
+++ b/source/dub/recipe/json.d
@@ -149,8 +149,6 @@
 	}
 
 	enforce(!config.name.empty, "Configuration is missing a name.");
-
-	BuildSettingsTemplate bs;
 	config.buildSettings.parseJson(json, package_name);
 }
 
diff --git a/source/dub/recipe/sdl.d b/source/dub/recipe/sdl.d
index d45bd10..7f3ad45 100644
--- a/source/dub/recipe/sdl.d
+++ b/source/dub/recipe/sdl.d
@@ -182,8 +182,6 @@
 	Dependency dep = Dependency.any;
 	auto attrs = t.attributes;
 
-	auto pv = "version" in attrs;
-
 	if ("path" in attrs) {
 		if ("version" in attrs)
 			logDiagnostic("Ignoring version specification (%s) for path based dependency %s", attrs["version"][0].value.get!string, attrs["path"][0].value.get!string);