diff --git a/owlps-aggregator/owlps-aggregatord.c b/owlps-aggregator/owlps-aggregatord.c
index d19e2b5..ac4547c 100644
--- a/owlps-aggregator/owlps-aggregatord.c
+++ b/owlps-aggregator/owlps-aggregatord.c
@@ -278,12 +278,12 @@ int parse_config_file(int argc, char **argv)
     {
     case CFG_FILE_ERROR :
       fprintf(stderr,
-              "Error! Cannot open configuration file « %s »: %s.\n",
+              "Error! Cannot open configuration file \"%s\": %s.\n",
               config_file, strerror(errno)) ;
       break ;
     case CFG_PARSE_ERROR :
       fprintf(stderr,
-              "Error! Parsing of configuration file « %s » failed!\n",
+              "Error! Parsing of configuration file \"%s\" failed!\n",
               config_file) ;
       free(config_file) ;
       owl_run = owl_false ;
@@ -537,7 +537,7 @@ int read_loop(int sockfd)
                   ) ;
         }
       else if (VERBOSE_CHATTERBOX)
-        fprintf(stderr, "Request received from AP « %s ».\n",
+        fprintf(stderr, "Request received from AP \"%s\".\n",
                 owl_mac_bytes_to_string(request.ap_mac_addr_bytes)) ;
 
       got_request(request) ;
@@ -770,7 +770,7 @@ void got_request(owl_captured_request request)
   if (requests == NULL) // If the request list does not exist,
     {
       if (VERBOSE_INFO)
-        fprintf(stderr, "Creating request list with AP « %s ».\n",
+        fprintf(stderr, "Creating request list with AP \"%s\".\n",
                 owl_mac_bytes_to_string(request.ap_mac_addr_bytes)) ;
       tmp_request = malloc(sizeof(request_list)) ; // create it.
       tmp_request->type = request.type ;
@@ -830,7 +830,7 @@ void got_request(owl_captured_request request)
       if (tmp_request == NULL) // The request does not exist in the list
         {
           if (VERBOSE_INFO)
-            fprintf(stderr, "Create new request from AP « %s ».\n",
+            fprintf(stderr, "Create new request from AP \"%s\".\n",
                     owl_mac_bytes_to_string(request.ap_mac_addr_bytes)) ;
           tmp_request = malloc(sizeof(request_list)) ; // create it
           tmp_request->type = request.type ;
@@ -946,7 +946,7 @@ void* listen_for_aps(void *NULL_value)
 
       if (VERBOSE_INFO)
         fprintf(stderr,
-                "Got a Hello message from « %s »\n", ap_ip_addr) ;
+                "Got a Hello message from \"%s\"\n", ap_ip_addr) ;
 
       sem_wait(&lock_aps) ;
       update_ap(message.ap_mac_addr_bytes, ap_ip_addr) ;
@@ -1015,7 +1015,7 @@ ap_list* add_ap_front(uint8_t mac_addr_bytes[ETHER_ADDR_LEN])
       char mac_str[OWL_ETHER_ADDR_STRLEN] ;
       owl_mac_bytes_to_string_r(mac_addr_bytes, mac_str) ;
       fprintf(stderr,
-              "Creating AP with MAC address « %s »...\n", mac_str) ;
+              "Creating AP with MAC address \"%s\"...\n", mac_str) ;
     }
 
   ap_list *ap = malloc(sizeof(ap_list)) ;
@@ -1135,7 +1135,7 @@ void delete_ap(ap_list *ap)
       char mac_str[OWL_ETHER_ADDR_STRLEN] ;
       assert(ap) ;
       owl_mac_bytes_to_string_r(ap->mac_addr_bytes, mac_str) ;
-      fprintf(stderr, "Deleting AP « %s »...\n", mac_str) ;
+      fprintf(stderr, "Deleting AP \"%s\"...\n", mac_str) ;
     }
 
   unlink_ap(ap) ;
diff --git a/owlps-client/owlps-client.c b/owlps-client/owlps-client.c
index 26bc8eb..c2ef3bb 100644
--- a/owlps-client/owlps-client.c
+++ b/owlps-client/owlps-client.c
@@ -312,7 +312,7 @@ void check_configuration()
     if (options.direction < OWL_DIRECTION_MIN ||
         options.direction > OWL_DIRECTION_MAX)
       {
-        fprintf(stderr, "Error! « %"PRIu8" » is not a valid"
+        fprintf(stderr, "Error! \"%"PRIu8"\" is not a valid"
                 " direction.\n", options.direction) ;
         exit(OWL_ERR_BAD_USAGE) ;
       }
@@ -340,7 +340,7 @@ void check_configuration()
     {
 #ifdef DEBUG
       fprintf(stderr, "Warning! You cannot wait for a server answer when"
-              " you calibrate. Option -l ignored…\n") ;
+              " you calibrate. Option -l ignored...\n") ;
 #endif // DEBUG
       options.listening_port = 0 ;
     }
@@ -352,7 +352,7 @@ void check_configuration()
         {
 #ifdef DEBUG
           fprintf(stderr, "Warning! You cannot wait for a server answer"
-                  " when you flood. Option -l ignored…\n") ;
+                  " when you flood. Option -l ignored...\n") ;
 #endif // DEBUG
           options.listening_port = 0 ;
         }
@@ -363,7 +363,7 @@ void check_configuration()
 #ifdef DEBUG
           fprintf(stderr, "Warning! It is useless to detach from"
                   " the foreground if the flood mode is not activated"
-                  " Option -D ignored…\n") ;
+                  " Option -D ignored...\n") ;
 #endif // DEBUG
           options.daemon = owl_false ;
       }
@@ -443,7 +443,7 @@ void make_packet()
 
   if (is_calibration_request) // Calibration packet
     {
-      printf("Preparing calibration request packet…\n") ;
+      printf("Preparing calibration request packet...\n") ;
 
       offset = 0 ;
       packet_size =
@@ -478,7 +478,7 @@ void make_packet()
 
   else // Standard packet
     {
-      printf("Preparing request packet…\n") ;
+      printf("Preparing request packet...\n") ;
       packet_size = sizeof(uint8_t) + sizeof(owl_timestamp) ;
       packet = malloc(packet_size) ;
       memset(&packet[0], OWL_REQUEST_NORMAL, 1) ; // Packet type
diff --git a/owlps-listener/owlps-listenerd.c b/owlps-listener/owlps-listenerd.c
index d31b06e..89e2a15 100644
--- a/owlps-listener/owlps-listenerd.c
+++ b/owlps-listener/owlps-listenerd.c
@@ -404,12 +404,12 @@ int parse_config_file(int argc, char **argv)
     {
     case CFG_FILE_ERROR :
       fprintf(stderr,
-              "Error! Cannot open configuration file « %s »: %s.\n",
+              "Error! Cannot open configuration file \"%s\": %s.\n",
               config_file, strerror(errno)) ;
       break ;
     case CFG_PARSE_ERROR :
       fprintf(stderr,
-              "Error! Parsing of configuration file « %s » failed!\n",
+              "Error! Parsing of configuration file \"%s\" failed!\n",
               config_file) ;
       free(config_file) ;
       owl_run = owl_false ;
@@ -580,7 +580,7 @@ int check_configuration()
     case MODE_PASSIVE :
       break ;
     default :
-      fprintf(stderr, "Error! Unknown mode « %c ».\n", (char) GET_MODE()) ;
+      fprintf(stderr, "Error! Unknown mode \"%c\".\n", (char) GET_MODE()) ;
       print_usage() ;
       owl_run = owl_false ;
       return OWL_ERR_BAD_USAGE ;
@@ -640,7 +640,7 @@ int check_configuration()
       if (coordinates_provided)
         if (GET_MY_DIRECTION() < OWL_DIRECTION_MIN ||
             GET_MY_DIRECTION() > OWL_DIRECTION_MAX)
-          fprintf(stderr, "Warning! « %d » is not a valid"
+          fprintf(stderr, "Warning! \"%d\" is not a valid"
                   " direction.\n", (int) GET_MY_DIRECTION()) ;
 
       // Autocalibration port numbers
diff --git a/owlps-positioning/src/csvfilereader.cc b/owlps-positioning/src/csvfilereader.cc
index faad541..213542c 100644
--- a/owlps-positioning/src/csvfilereader.cc
+++ b/owlps-positioning/src/csvfilereader.cc
@@ -120,9 +120,9 @@ bool CSVFileReader::read_point3d(Point3D &p)
 void CSVFileReader::print_error_cast() const
 {
   cerr
-      << "Bad value « "
-      << *token_iterator << " » at line "
+      << "Bad value \""
+      << *token_iterator << "\" at line "
       << current_line_nb << ", field #"
-      << current_field_nb << ", of input file « "
-      << file_name << " »!" << endl ;
+      << current_field_nb << ", of input file \""
+      << file_name << "\"!" << endl ;
 }
diff --git a/owlps-positioning/src/input.cc b/owlps-positioning/src/input.cc
index 40db41d..27a0f87 100644
--- a/owlps-positioning/src/input.cc
+++ b/owlps-positioning/src/input.cc
@@ -69,7 +69,7 @@ void Input::initialise_input_medium()
 
   else
     throw bad_configuration(
-      "The specified input medium « "+ medium_name +" » is unknown!") ;
+      "The specified input medium \""+ medium_name +"\" is unknown!") ;
 }
 
 
@@ -92,8 +92,8 @@ void Input::initialise_log_media()
 
       else
         throw bad_configuration(
-          "The input medium « "+ *i +
-          " » specified for request logging is unknown!") ;
+          "The input medium \""+ *i +
+          "\" specified for request logging is unknown!") ;
     }
 }
 
diff --git a/owlps-positioning/src/inputdatareader.cc b/owlps-positioning/src/inputdatareader.cc
index 637286f..810864c 100644
--- a/owlps-positioning/src/inputdatareader.cc
+++ b/owlps-positioning/src/inputdatareader.cc
@@ -65,7 +65,7 @@ void InputDataReader::initialise_access_points_media()
 
       else
         throw bad_configuration(
-          "Access points input medium type unknown « "+ *i +" »") ;
+          "Access points input medium type unknown \""+ *i +"\"") ;
     }
 }
 
@@ -110,7 +110,7 @@ void InputDataReader::initialise_mobiles_media()
 
       else
         throw bad_configuration(
-          "Mobiles' input medium type unknown « "+ *i +" »") ;
+          "Mobiles' input medium type unknown \""+ *i +"\"") ;
     }
 }
 
@@ -159,7 +159,7 @@ void InputDataReader::initialise_topology_media()
 
       else
         throw bad_configuration(
-          "Topology input medium type unknown « "+ *i +" »") ;
+          "Topology input medium type unknown \""+ *i +"\"") ;
     }
 }
 
@@ -214,7 +214,7 @@ void InputDataReader::initialise_reference_points_media()
 
       else
         throw bad_configuration(
-          "Reference points input medium type unknown « "+ *i +" »") ;
+          "Reference points input medium type unknown \""+ *i +"\"") ;
     }
 }
 
diff --git a/owlps-positioning/src/output.cc b/owlps-positioning/src/output.cc
index 4e91017..43e115e 100644
--- a/owlps-positioning/src/output.cc
+++ b/owlps-positioning/src/output.cc
@@ -63,7 +63,7 @@ void Output::initialise_output_media()
 
       else
         throw bad_configuration(
-          "The specified output medium « "+ *i +" » is unknown!") ;
+          "The specified output medium \""+ *i +"\" is unknown!") ;
     }
 }
 
diff --git a/owlps-positioning/src/outputtcpsocketevaal.cc b/owlps-positioning/src/outputtcpsocketevaal.cc
index ebec47e..2415403 100644
--- a/owlps-positioning/src/outputtcpsocketevaal.cc
+++ b/owlps-positioning/src/outputtcpsocketevaal.cc
@@ -109,8 +109,8 @@ area_of_interest_number(const Point3D &position) const
   catch (boost::bad_lexical_cast &e)
     {
       cerr
-          << "Cannot convert the area of interest's name (« "
-          << area->get_name() << " ») into an integer value: "
+          << "Cannot convert the area of interest's name (\""
+          << area->get_name() << "\") into an integer value: "
           << e.what() << '\n' ;
     }
 
@@ -153,7 +153,7 @@ bool OutputTCPSocketEvAAL::acknowledge() const
     }
 
   cerr
-      << "TCP server error: unknown acknoledgment string « "
-      << ack << " ».\n" ;
+      << "TCP server error: unknown acknoledgment string \""
+      << ack << "\".\n" ;
   return false ;
 }
diff --git a/owlps-positioning/src/posexcept.cc b/owlps-positioning/src/posexcept.cc
index 1f1fcde..10d1c01 100644
--- a/owlps-positioning/src/posexcept.cc
+++ b/owlps-positioning/src/posexcept.cc
@@ -70,9 +70,9 @@ null_input_medium::null_input_medium() throw():
 
 error_opening_input_file::
 error_opening_input_file(const string &file_name) throw():
-  posexcept("Error opening input file « " + file_name + " »!") {}
+  posexcept("Error opening input file \"" + file_name + "\"!") {}
 
 
 error_opening_output_file::
 error_opening_output_file(const string &file_name) throw():
-  posexcept("Error opening output file « " + file_name + " »!") {}
+  posexcept("Error opening output file \"" + file_name + "\"!") {}
diff --git a/owlps-positioning/src/positioning.cc b/owlps-positioning/src/positioning.cc
index 4dc5649..c2fad63 100644
--- a/owlps-positioning/src/positioning.cc
+++ b/owlps-positioning/src/positioning.cc
@@ -113,8 +113,8 @@ void Positioning::initialise_algorithms()
 
       else
         throw bad_configuration(
-          "The specified positioning_algorithm « "+ *i +
-          " » is unknown!") ;
+          "The specified positioning_algorithm \""+ *i +
+          "\" is unknown!") ;
     }
 }
 
@@ -145,8 +145,8 @@ void Positioning::loop()
             {
               cerr
                   << "Cannot compute with algorithm "
-                  << (*algo)->get_name() << ": « "
-                  << e.what() << " »\n" ;
+                  << (*algo)->get_name() << ": \""
+                  << e.what() << "\"\n" ;
               continue ;
             }
 
diff --git a/owlps-positioning/src/result.cc b/owlps-positioning/src/result.cc
index 003e517..561e7b2 100644
--- a/owlps-positioning/src/result.cc
+++ b/owlps-positioning/src/result.cc
@@ -109,7 +109,7 @@ std::ostream& operator<<(ostream &os, const Result &r)
   os
       << "The result of the algorithm " << r.algorithm
       << " is: " << r.position
-      << " (area: « " << r.in_which_area() << " »)" ;
+      << " (area: \"" << r.in_which_area() << "\")" ;
   if (r.error >= 0)
     os << ", error = " << r.error << " m" ;
   return os ;
diff --git a/owlps-positioning/src/stock.cc b/owlps-positioning/src/stock.cc
index d8698b7..1967d18 100644
--- a/owlps-positioning/src/stock.cc
+++ b/owlps-positioning/src/stock.cc
@@ -79,7 +79,7 @@ const Building& Stock::get_building(const string &name)
     buildings.find(name) ;
   if (i != buildings.end())
     return i->second ;
-  throw element_not_found("No Building with name « " + name + " »!") ;
+  throw element_not_found("No Building with name \"" + name + "\"!") ;
 }
 
 
@@ -166,8 +166,8 @@ const Mobile& Stock::get_mobile(const string &mac)
   unordered_map<string, Mobile>::const_iterator i = mobiles.find(mac) ;
   if (i != mobiles.end())
     return i->second ;
-  throw element_not_found("No Mobile with MAC address « " +
-                          mac + " »!") ;
+  throw element_not_found("No Mobile with MAC address \"" +
+                          mac + "\"!") ;
 }
 
 
@@ -230,8 +230,8 @@ const AccessPoint& Stock::get_ap(const string &mac)
   unordered_map<string, AccessPoint>::const_iterator i = aps.find(mac) ;
   if (i != aps.end())
     return i->second ;
-  throw element_not_found("No AccessPoint with MAC address « " +
-                          mac + " »!") ;
+  throw element_not_found("No AccessPoint with MAC address \"" +
+                          mac + "\"!") ;
 }
 
 
@@ -249,8 +249,8 @@ const AccessPoint& Stock::find_create_ap(const string &mac)
 
   if (Configuration::is_configured("verbose"))
     cerr
-        << "New AP « " << mac
-        << " » (total: " << nb_aps() << " APs).\n" ;
+        << "New AP \"" << mac
+        << "\" (total: " << nb_aps() << " APs).\n" ;
 
   return ap ;
 }
diff --git a/owlps-positioning/src/userinterface.cc b/owlps-positioning/src/userinterface.cc
index 7eb19f6..6f9ba2f 100644
--- a/owlps-positioning/src/userinterface.cc
+++ b/owlps-positioning/src/userinterface.cc
@@ -374,9 +374,9 @@ void UserInterface::parse_file() const
   if (! config_file)
     {
       cerr
-          << "Warning! Error opening input configuration file « "
+          << "Warning! Error opening input configuration file \""
           << config_file_name
-          << " »! Using command line and default values…"
+          << "\"! Using command line and default values..."
           << endl ;
       return ;
     }