diff --git a/TunDevice.cpp b/TunDevice.cpp
index 0ac330c..ac7f4b1 100644
--- a/TunDevice.cpp
+++ b/TunDevice.cpp
@@ -7,12 +7,13 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #include "TunDevice.hpp"
 
 static const size_t TUN_MTU = 1500;  // TODO determine this cleanly
 
-TunDevice::TunDevice(const std::string& dev)
+TunDevice::TunDevice(const char* dev)
 {
     struct ifreq ifr;
     int fd;
@@ -30,12 +31,12 @@ TunDevice::TunDevice(const std::string& dev)
      *        IFF_NO_PI - Do not provide packet information
      */
     ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
-    if(!dev.empty()) {
-        if(dev.size() >= IFNAMSIZ - 2) {
+    if(dev != nullptr) {
+        if(strlen(dev) >= IFNAMSIZ - 2) {
             fprintf(stderr, "Tun device: device name is too long.\n");
             exit(1);
         }
-        strncpy(ifr.ifr_name, dev.c_str(), IFNAMSIZ-1);
+        strncpy(ifr.ifr_name, dev, IFNAMSIZ-1);
     }
 
     if(ioctl(fd, TUNSETIFF, (void *) &ifr) < 0){
@@ -79,7 +80,7 @@ uint16_t TunDevice::get_mtu() const {
 
     struct ifreq ifr;
     ifr.ifr_addr.sa_family = AF_INET6;
-    strncpy(ifr.ifr_name, _dev_name.c_str(), sizeof(ifr.ifr_name)-1);
+    strncpy(ifr.ifr_name, _dev_name, sizeof(ifr.ifr_name)-1);
     if (ioctl(sockfd, SIOCGIFMTU, (caddr_t)&ifr) < 0)
         return 0;
     close(sockfd);
@@ -91,7 +92,7 @@ bool TunDevice::set_mtu(uint16_t mtu) {
 
     struct ifreq ifr;
     ifr.ifr_addr.sa_family = AF_INET6;
-    strncpy(ifr.ifr_name, _dev_name.c_str(), sizeof(ifr.ifr_name)-1);
+    strncpy(ifr.ifr_name, _dev_name, sizeof(ifr.ifr_name)-1);
     ifr.ifr_mtu = mtu;
     if (ioctl(sockfd, SIOCSIFMTU, (caddr_t)&ifr) < 0)
         return false;
diff --git a/TunDevice.hpp b/TunDevice.hpp
index 7a54491..1d82024 100644
--- a/TunDevice.hpp
+++ b/TunDevice.hpp
@@ -1,15 +1,14 @@
 #pragma once
 
-#include <string>
 #include <poll.h>
 #include "util.hpp"
 
 class TunDevice {
     public:
-        TunDevice(const std::string& dev);
+        TunDevice(const char* dev);
         ~TunDevice();
 
-        const std::string& get_dev_name() const { return _dev_name; }
+        const char* get_dev_name() const { return _dev_name; }
         int get_fd() const { return _fd; }
 
         /** Get the interface's MTU */
@@ -31,7 +30,7 @@ class TunDevice {
 
     private:
         int _fd;
-        std::string _dev_name;
+        char*_dev_name;
         struct pollfd _poll_fd;
         size_t _last_read_size;
 };
diff --git a/UdpVpn.cpp b/UdpVpn.cpp
index b7cb9eb..fb8262b 100644
--- a/UdpVpn.cpp
+++ b/UdpVpn.cpp
@@ -9,6 +9,7 @@
 #include <poll.h>
 #include <errno.h>
 #include <math.h>
+#include <stdio.h>
 
 #include "ip_header.hpp"
 
diff --git a/UdpVpnServer.cpp b/UdpVpnServer.cpp
index 40cba72..27721db 100644
--- a/UdpVpnServer.cpp
+++ b/UdpVpnServer.cpp
@@ -1,4 +1,5 @@
 #include <string.h>
+#include <stdio.h>
 
 #include "UdpVpnServer.hpp"
 #include "ip_header.hpp"
diff --git a/VpnPacket.cpp b/VpnPacket.cpp
index ebec760..ed1fd6b 100644
--- a/VpnPacket.cpp
+++ b/VpnPacket.cpp
@@ -2,6 +2,8 @@
 #include "VpnPeer.hpp"
 
 #include <string.h>
+#include <stdio.h>
+#include <utility>
 
 const size_t VpnPacket::VPN_HEADER_BYTES = 8;
 const size_t VpnControlPacket::TLV_HEADER_BYTES = 3;
diff --git a/VpnPeer.cpp b/VpnPeer.cpp
index a424853..3b48373 100644
--- a/VpnPeer.cpp
+++ b/VpnPeer.cpp
@@ -1,6 +1,7 @@
 #include "UdpVpn.hpp"
 #include "congestion_control.hpp"
 
+#include <stdio.h>
 #include <stdint.h>
 #include <string.h>
 
diff --git a/congestion_control.cpp b/congestion_control.cpp
index 2e2341b..7f1d120 100644
--- a/congestion_control.cpp
+++ b/congestion_control.cpp
@@ -47,5 +47,6 @@ void CongestionController::update_lossbased() {
 void CongestionController::update_params() {
     _bandwidth = _loss_based.bandwidth; // meant to integrate other controllers
     _bucket_max_level = _bandwidth * _peer.get_rtt().avg_rtt();
-    _bucket_level = std::min(_bucket_level, _bucket_max_level);
+    if(_bucket_level > _bucket_max_level)
+        _bucket_level = _bucket_max_level;
 }
diff --git a/util.cpp b/util.cpp
index b6c782b..c65f4f3 100644
--- a/util.cpp
+++ b/util.cpp
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <stdarg.h>
 #include <arpa/inet.h>
+#include <time.h>
 
 #include "util.hpp"
 
@@ -89,23 +90,3 @@ uint32_t current_us_timestamp() {
     clock_gettime(CLOCK_MONOTONIC, &now);
     return (now.tv_sec * 1000*1000) + (now.tv_nsec / 1000);
 }
-
-namespace std {
-size_t hash<in6_addr>::operator() (const in6_addr& addr) const {
-    size_t out_hash = 0;
-    for(int i=0; i < 4; ++i) {
-        uint32_t value;
-        memcpy((unsigned char*)(&value),
-               addr.s6_addr + 4*i,
-               4);
-        out_hash ^= (std::hash<uint32_t>{}(value) << 1);
-    }
-    return out_hash;
-}
-
-bool equal_to<in6_addr>::operator()(
-        const in6_addr& lhs, const in6_addr& rhs) const
-{
-    return memcmp(lhs.s6_addr, rhs.s6_addr, sizeof(lhs.s6_addr)) == 0;
-}
-}
diff --git a/util.hpp b/util.hpp
index 85b5c65..7db205e 100644
--- a/util.hpp
+++ b/util.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <string>
 #include <netinet/in.h>
 
 /* Debugging -- taken from babeld */
@@ -78,20 +77,3 @@ uint32_t timespec_us_ellapsed(const struct timespec ref);
 
 /** Get the current timestamp, in microseconds */
 uint32_t current_us_timestamp();
-
-
-
-/** in6_addr hash & equality */
-namespace std {
-    template<>
-    class hash<in6_addr> {
-        public:
-            size_t operator()(const in6_addr& addr) const;
-    };
-
-    template<>
-    class equal_to<in6_addr> {
-        public:
-            bool operator()(const in6_addr& lhs, const in6_addr& rhs) const;
-    };
-}