Fixed GCC build

src/audio/DCOffset.cpp

@@ -1,5 +1,6 @@
 #include "DCOffset.h"
 #include <gsl_util.h>
+#include <cmath>
 
 DCOffset::DCOffset(std::unique_ptr<AudioStream> inputStream, float offset) :
 	inputStream(std::move(inputStream)),

src/audio/WaveFileReader.cpp

@@ -37,7 +37,7 @@ WaveFileReader::WaveFileReader(boost::filesystem::path filePath) :
 	std::streamoff fileSize = file.tellg();
 	file.seekg(0);
 
-	auto remaining = [&](size_t byteCount) {
+	auto remaining = [&](int byteCount) {
 		std::streamoff filePosition = file.tellg();
 		return byteCount <= fileSize - filePosition;
 	};

src/centiseconds.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <chrono>
+#include <ostream>
 
 typedef std::chrono::duration<int, std::centi> centiseconds;