diff --git a/.waf-tools/default-compiler-flags.py b/.waf-tools/default-compiler-flags.py
index bba2b1e..2be9d90 100644
--- a/.waf-tools/default-compiler-flags.py
+++ b/.waf-tools/default-compiler-flags.py
@@ -1,44 +1,45 @@
 # -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
 
-from waflib import Logs, Configure, Utils
+from waflib import Configure, Logs, Utils
 
 def options(opt):
-    opt.add_option('--debug', '--with-debug', action='store_true', default=False, dest='debug',
-                   help='''Compile in debugging mode with minimal optimizations (-O0 or -Og)''')
+    opt.add_option('--debug', '--with-debug', action='store_true', default=False,
+                   help='Compile in debugging mode with minimal optimizations (-O0 or -Og)')
 
 def configure(conf):
     conf.start_msg('Checking C++ compiler version')
 
-    cxx = conf.env['CXX_NAME'] # CXX_NAME is the generic name of the compiler
-    ccver = tuple(int(i) for i in conf.env['CC_VERSION'])
+    cxx = conf.env.CXX_NAME # generic name of the compiler
+    ccver = tuple(int(i) for i in conf.env.CC_VERSION)
+    ccverstr = '.'.join(conf.env.CC_VERSION)
     errmsg = ''
     warnmsg = ''
     if cxx == 'gcc':
-        if ccver < (4, 8, 2):
+        if ccver < (5, 3, 0):
             errmsg = ('The version of gcc you are using is too old.\n'
-                      'The minimum supported gcc version is 4.8.2.')
+                      'The minimum supported gcc version is 5.3.0.')
         conf.flags = GccFlags()
     elif cxx == 'clang':
-        if ccver < (3, 4, 0):
+        if ccver < (3, 6, 0):
             errmsg = ('The version of clang you are using is too old.\n'
-                      'The minimum supported clang version is 3.4.0.')
+                      'The minimum supported clang version is 3.6.0.')
         conf.flags = ClangFlags()
     else:
         warnmsg = 'Note: %s compiler is unsupported' % cxx
         conf.flags = CompilerFlags()
 
     if errmsg:
-        conf.end_msg('.'.join(conf.env['CC_VERSION']), color='RED')
+        conf.end_msg(ccverstr, color='RED')
         conf.fatal(errmsg)
     elif warnmsg:
-        conf.end_msg('.'.join(conf.env['CC_VERSION']), color='YELLOW')
+        conf.end_msg(ccverstr, color='YELLOW')
         Logs.warn(warnmsg)
     else:
-        conf.end_msg('.'.join(conf.env['CC_VERSION']))
+        conf.end_msg(ccverstr)
 
     conf.areCustomCxxflagsPresent = (len(conf.env.CXXFLAGS) > 0)
 
-    # General flags are always applied (e.g., selecting C++11 mode)
+    # General flags are always applied (e.g., selecting C++ language standard)
     generalFlags = conf.flags.getGeneralFlags(conf)
     conf.add_supported_cxxflags(generalFlags['CXXFLAGS'])
     conf.add_supported_linkflags(generalFlags['LINKFLAGS'])
@@ -53,10 +54,10 @@
         extraFlags = conf.flags.getDebugFlags(conf)
         if conf.areCustomCxxflagsPresent:
             missingFlags = [x for x in extraFlags['CXXFLAGS'] if x not in conf.env.CXXFLAGS]
-            if len(missingFlags) > 0:
-                Logs.warn("Selected debug mode, but CXXFLAGS is set to a custom value '%s'"
-                          % " ".join(conf.env.CXXFLAGS))
-                Logs.warn("Default flags '%s' are not activated" % " ".join(missingFlags))
+            if missingFlags:
+                Logs.warn('Selected debug mode, but CXXFLAGS is set to a custom value "%s"'
+                          % ' '.join(conf.env.CXXFLAGS))
+                Logs.warn('Default flags "%s" will not be used' % ' '.join(missingFlags))
     else:
         extraFlags = conf.flags.getOptimizedFlags(conf)
 
@@ -106,6 +107,9 @@
 
 
 class CompilerFlags(object):
+    def getCompilerVersion(self, conf):
+        return tuple(int(i) for i in conf.env.CC_VERSION)
+
     def getGeneralFlags(self, conf):
         """Get dict of CXXFLAGS, LINKFLAGS, and DEFINES that are always needed"""
         return {'CXXFLAGS': [], 'LINKFLAGS': [], 'DEFINES': []}
@@ -124,7 +128,7 @@
     """
     def getGeneralFlags(self, conf):
         flags = super(GccBasicFlags, self).getGeneralFlags(conf)
-        flags['CXXFLAGS'] += ['-std=c++11']
+        flags['CXXFLAGS'] += ['-std=c++14']
         return flags
 
     def getDebugFlags(self, conf):
@@ -160,25 +164,19 @@
 class GccFlags(GccBasicFlags):
     def getDebugFlags(self, conf):
         flags = super(GccFlags, self).getDebugFlags(conf)
-        version = tuple(int(i) for i in conf.env['CC_VERSION'])
-        if version < (5, 1, 0):
-            flags['CXXFLAGS'] += ['-Wno-missing-field-initializers']
-        flags['CXXFLAGS'] += ['-fdiagnostics-color'] # gcc >= 4.9
+        flags['CXXFLAGS'] += ['-fdiagnostics-color']
         return flags
 
     def getOptimizedFlags(self, conf):
         flags = super(GccFlags, self).getOptimizedFlags(conf)
-        version = tuple(int(i) for i in conf.env['CC_VERSION'])
-        if version < (5, 1, 0):
-            flags['CXXFLAGS'] += ['-Wno-missing-field-initializers']
-        flags['CXXFLAGS'] += ['-fdiagnostics-color'] # gcc >= 4.9
+        flags['CXXFLAGS'] += ['-fdiagnostics-color']
         return flags
 
 class ClangFlags(GccBasicFlags):
     def getGeneralFlags(self, conf):
         flags = super(ClangFlags, self).getGeneralFlags(conf)
-        version = tuple(int(i) for i in conf.env['CC_VERSION'])
-        if Utils.unversioned_sys_platform() == 'darwin' and version >= (9, 0, 0): # Bug #4296
+        if Utils.unversioned_sys_platform() == 'darwin' and self.getCompilerVersion(conf) >= (9, 0, 0):
+            # Bug #4296
             flags['CXXFLAGS'] += [['-isystem', '/usr/local/include'], # for Homebrew
                                   ['-isystem', '/opt/local/include']] # for MacPorts
         return flags
@@ -194,7 +192,7 @@
                               '-Wno-error=unneeded-internal-declaration', # Bug #1588
                               '-Wno-unused-local-typedef', # Bugs #2657 and #3209
                               ]
-        version = tuple(int(i) for i in conf.env['CC_VERSION'])
+        version = self.getCompilerVersion(conf)
         if version < (3, 9, 0) or (Utils.unversioned_sys_platform() == 'darwin' and version < (8, 1, 0)):
             flags['CXXFLAGS'] += ['-Wno-unknown-pragmas']
         return flags
@@ -206,7 +204,7 @@
                               '-Wundefined-func-template',
                               '-Wno-unused-local-typedef', # Bugs #2657 and #3209
                               ]
-        version = tuple(int(i) for i in conf.env['CC_VERSION'])
+        version = self.getCompilerVersion(conf)
         if version < (3, 9, 0) or (Utils.unversioned_sys_platform() == 'darwin' and version < (8, 1, 0)):
             flags['CXXFLAGS'] += ['-Wno-unknown-pragmas']
         return flags
diff --git a/src/challenge-module.cpp b/src/challenge-module.cpp
index c1f3432..f40e5b9 100644
--- a/src/challenge-module.cpp
+++ b/src/challenge-module.cpp
@@ -124,7 +124,7 @@
   json.put(JSON_REQUEST_ID, requestId);
   std::stringstream ss;
   boost::property_tree::write_json(ss, json);
-  Block jsonBlock = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonBlock = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
   Name name = caName;
   name.append("_DOWNLOAD").append(jsonBlock);
   return name;
diff --git a/src/challenge-module/challenge-email.cpp b/src/challenge-module/challenge-email.cpp
index c63961c..b65d331 100644
--- a/src/challenge-module/challenge-email.cpp
+++ b/src/challenge-module/challenge-email.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2017, Regents of the University of California.
+ * Copyright (c) 2017-2018, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -20,7 +20,7 @@
 
 #include "challenge-email.hpp"
 #include "../logging.hpp"
-#include <boost/regex.hpp>
+#include <regex>
 
 namespace ndn {
 namespace ndncert {
@@ -179,9 +179,9 @@
 bool
 ChallengeEmail::isValidEmailAddress(const std::string& emailAddress)
 {
-  std::string pattern = R"_REGEX_((^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9\-\.]+$))_REGEX_";
-  boost::regex emailPattern(pattern);
-  return boost::regex_match(emailAddress, emailPattern);
+  const std::string pattern = R"_REGEX_((^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9\-\.]+$))_REGEX_";
+  static const std::regex emailPattern(pattern);
+  return std::regex_match(emailAddress, emailPattern);
 }
 
 void
diff --git a/src/client-module.cpp b/src/client-module.cpp
index fff47af..0c9565e 100644
--- a/src/client-module.cpp
+++ b/src/client-module.cpp
@@ -508,7 +508,7 @@
 {
   std::stringstream ss;
   boost::property_tree::write_json(ss, json);
-  return makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  return makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 }
 
 bool
diff --git a/tests/unit-tests/challenge-email.t.cpp b/tests/unit-tests/challenge-email.t.cpp
index f048f61..f723f6a 100644
--- a/tests/unit-tests/challenge-email.t.cpp
+++ b/tests/unit-tests/challenge-email.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2017, Regents of the University of California.
+ * Copyright (c) 2017-2018, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -65,7 +65,7 @@
   emailJson.put(ChallengeEmail::JSON_EMAIL, "zhiyi@cs.ucla.edu");
   std::stringstream ss;
   boost::property_tree::write_json(ss, emailJson);
-  Block jsonContent = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonContent = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 
   Name interestName("/ndn/site1/CA");
   interestName.append("_SELECT").append("Fake-Request-ID").append("EMAIL").append(jsonContent);
@@ -106,7 +106,7 @@
   emailJson.put(ChallengeEmail::JSON_EMAIL, "zhiyi@cs");
   std::stringstream ss;
   boost::property_tree::write_json(ss, emailJson);
-  Block jsonContent = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonContent = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 
   Name interestName("/ndn/site1/CA");
   interestName.append("_SELECT").append("Fake-Request-ID").append("EMAIL").append(jsonContent);
@@ -140,7 +140,7 @@
   infoJson.put(ChallengeEmail::JSON_CODE, "4567");
   std::stringstream ss;
   boost::property_tree::write_json(ss, infoJson);
-  Block jsonContent = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonContent = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 
   Name interestName("/ndn/site1/CA");
   interestName.append("_VALIDATE").append("Fake-Request-ID").append("EMAIL").append(jsonContent);
@@ -174,7 +174,7 @@
   infoJson.put(ChallengeEmail::JSON_CODE, "1234");
   std::stringstream ss;
   boost::property_tree::write_json(ss, infoJson);
-  Block jsonContent = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonContent = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 
   Name interestName("/ndn/site1/CA");
   interestName.append("_VALIDATE").append("Fake-Request-ID").append("EMAIL").append(jsonContent);
diff --git a/tests/unit-tests/challenge-pin.t.cpp b/tests/unit-tests/challenge-pin.t.cpp
index 633dd8f..2b7e377 100644
--- a/tests/unit-tests/challenge-pin.t.cpp
+++ b/tests/unit-tests/challenge-pin.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2017, Regents of the University of California.
+ * Copyright (c) 2017-2018, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -18,8 +18,8 @@
  * See AUTHORS.md for complete list of ndncert authors and contributors.
  */
 
-#include "identity-management-fixture.hpp"
 #include "challenge-module/challenge-pin.hpp"
+#include "identity-management-fixture.hpp"
 
 namespace ndn {
 namespace ndncert {
@@ -87,7 +87,7 @@
   std::stringstream ss;
   boost::property_tree::write_json(ss, infoJson);
   std::string jsonString = ss.str();
-  Block jsonContent = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonContent = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 
   Name interestName("/ndn/site1/CA");
   interestName.append("_VALIDATE").append("Fake-Request-ID").append("PIN").append(jsonContent);
@@ -122,7 +122,7 @@
   std::stringstream ss;
   boost::property_tree::write_json(ss, infoJson);
   std::string jsonString = ss.str();
-  Block jsonContent = makeStringBlock(ndn::tlv::NameComponent, ss.str());
+  Block jsonContent = makeStringBlock(ndn::tlv::GenericNameComponent, ss.str());
 
   Name interestName("/ndn/site1/CA");
   interestName.append("_VALIDATE").append("Fake-Request-ID").append("PIN").append(jsonContent);
diff --git a/tools/ndncert-ca-server.cpp b/tools/ndncert-ca-server.cpp
index 9e25555..c666d34 100644
--- a/tools/ndncert-ca-server.cpp
+++ b/tools/ndncert-ca-server.cpp
@@ -105,7 +105,11 @@
             auto issuedCert = request.getCert();
             using namespace boost::asio::ip;
             tcp::iostream requestStream;
+#if BOOST_VERSION >= 106700
+            requestStream.expires_after(std::chrono::seconds(3));
+#else
             requestStream.expires_from_now(boost::posix_time::seconds(3));
+#endif // BOOST_VERSION >= 106700
             requestStream.connect(repoHost, repoPort);
             if (!requestStream) {
               std::cerr << "ERROR: Cannot publish certificate to repo-ng"