--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
--- a/accept-confirmation.cpp
+++ b/accept-confirmation.cpp
@@ -52,7 +52,7 @@ 
     for (rc = read(fd, tmp, sizeof(tmp)); rc > 0; rc = read(fd, tmp, sizeof(tmp)))
       mail.append(tmp, rc);
     if (rc < 0)
-      throw system_error(string("Failed to read mail file '") + filename + "'");
+      throw Mapson::system_error(string("Failed to read mail file '") + filename + "'");
     deliver(mail);
     unlink(filename.c_str());
   }
--- a/address-db.cpp
+++ b/address-db.cpp
@@ -26,7 +26,7 @@ 
 
   fd = open(filename.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
   if (fd < 0)
-    throw system_error(string("Can't open address db '") +
+    throw Mapson::system_error(string("Can't open address db '") +
                       filename + "' for reading");
   fd_sentry sentry(fd);
 
@@ -36,7 +36,7 @@ 
   lock.l_start  = 0;
   lock.l_len    = 0;
   if (fcntl(fd, F_SETLKW, &lock) != 0)
-    throw system_error(string("Can't lock file '") + filename + "'");
+    throw Mapson::system_error(string("Can't lock file '") + filename + "'");
 
   // Read the file into memory.
 
@@ -47,7 +47,7 @@ 
        rc = read(fd, buffer, sizeof(buffer)))
     data.append(buffer, rc);
   if (rc < 0)
-    throw system_error(string("Failed to read address db '") +
+    throw Mapson::system_error(string("Failed to read address db '") +
                       filename + "' into memory");
 
   // Success. Don't close the file descriptor.
@@ -107,7 +107,7 @@ 
   {
     ssize_t rc = write(fd, data.data()+len, data.size()-len);
     if (rc < 0)
-      throw system_error(string("Failed writing to the address db '") + filename + "'");
+      throw Mapson::system_error(string("Failed writing to the address db '") + filename + "'");
     else
       len += rc;
   }
--- a/config.cpp
+++ b/config.cpp
@@ -70,9 +70,9 @@ 
     string tmp = string(name) + "=" + value;
     char* env = strdup(tmp.c_str());
     if (env == 0)
-      throw system_error("strdup() failed");
+      throw Mapson::system_error("strdup() failed");
     if (putenv(env) != 0)
-      throw system_error("putenv() failed");
+      throw Mapson::system_error("putenv() failed");
   }
 }
 
@@ -84,7 +84,7 @@ 
 
   pwd_sentry sentry(getpwuid(getuid()));
   if (sentry.pwd == 0)
-    throw system_error("Can't get my user name");
+    throw Mapson::system_error("Can't get my user name");
   log_file.assign(sentry.pwd->pw_dir).append("/.mapson/log");
   spool_dir.assign(sentry.pwd->pw_dir).append("/.mapson/spool");
   address_db.assign(sentry.pwd->pw_dir).append("/.mapson/address-db");
--- a/deliver.cpp
+++ b/deliver.cpp
@@ -31,11 +31,11 @@ 
 
     FILE* fh = popen(config->mailbox.c_str()+1, "w");
     if (fh == NULL)
-      throw system_error(string("Can't start delivery pipe '") + config->mailbox + "'");
+      throw Mapson::system_error(string("Can't start delivery pipe '") + config->mailbox + "'");
     int len = fwrite(mail.data(), mail.size(), 1, fh);
     pclose(fh);
     if (len != 1)
-      throw system_error(string("Failed to pipe to MTA process '") + config->mailbox + "'");
+      throw Mapson::system_error(string("Failed to pipe to MTA process '") + config->mailbox + "'");
   }
   else
   {
@@ -43,7 +43,7 @@ 
 
     int fd = open(config->mailbox.c_str(), O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
     if (fd < 0)
-      throw system_error(string("Can't open mailbox file '") + config->mailbox + "' for writing");
+      throw Mapson::system_error(string("Can't open mailbox file '") + config->mailbox + "' for writing");
     fd_sentry sentry(fd);
 
     struct flock lock;
@@ -52,13 +52,13 @@ 
     lock.l_start  = 0;
     lock.l_len    = 0;
     if (fcntl(fd, F_SETLKW, &lock) != 0)
-      throw system_error(string("Can't lock file '") + config->mailbox + "'");
+      throw Mapson::system_error(string("Can't lock file '") + config->mailbox + "'");
 
     for (size_t len = 0; len < mail.size(); )
     {
       ssize_t rc = write(fd, mail.data()+len, mail.size()-len);
       if (rc < 0)
-        throw system_error(string("Failed writing to the mailbox file '") + config->mailbox + "'");
+        throw Mapson::system_error(string("Failed writing to the mailbox file '") + config->mailbox + "'");
       else
         len += rc;
     }
--- a/lines2regex.cpp
+++ b/lines2regex.cpp
@@ -29,7 +29,7 @@ 
     if (errno == ENOENT)
       return "";
     else
-      throw system_error(string("Can't open regex db '") +
+      throw Mapson::system_error(string("Can't open regex db '") +
                         filename + "' for reading");
   }
   fd_sentry sentry(fd);
@@ -40,7 +40,7 @@ 
   lock.l_start  = 0;
   lock.l_len    = 0;
   if (fcntl(fd, F_SETLKW, &lock) != 0)
-    throw system_error(string("Can't lock file '") + filename + "'");
+    throw Mapson::system_error(string("Can't lock file '") + filename + "'");
 
   // Read the file into memory.
 
@@ -52,7 +52,7 @@ 
        rc = read(fd, buffer, sizeof(buffer)))
     data.append(buffer, rc);
   if (rc < 0)
-    throw system_error(string("Failed to read regex db '") +
+    throw Mapson::system_error(string("Failed to read regex db '") +
                       filename + "' into memory");
 
   // Walk through the lines and compile the regexes.
--- a/log.cpp
+++ b/log.cpp
@@ -30,10 +30,10 @@ 
   char buf[64];
   time_t tstamp = time(0);
   if (tstamp == static_cast<time_t>(-1))
-    throw system_error("time(2) failed");
+    throw Mapson::system_error("time(2) failed");
   struct tm* tmtime = localtime(&tstamp);
   if (tmtime == 0)
-    throw system_error("localtime(3) failed");
+    throw Mapson::system_error("localtime(3) failed");
   strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tmtime);
   return buf;
 }
@@ -42,7 +42,7 @@ 
 {
   fileh.file = fopen(file, "a");
   if (fileh.file == 0)
-    throw system_error(string("Could not open log file ") + file);
+    throw Mapson::system_error(string("Could not open log file ") + file);
 
   struct flock lock;
   lock.l_type = F_WRLCK;
@@ -50,7 +50,7 @@ 
   lock.l_start  = 0;
   lock.l_len    = 0;
   if (fcntl(fileno(fileh.file), F_SETLKW, &lock) != 0)
-    throw system_error(string("Can't lock file '") + file + "'");
+    throw Mapson::system_error(string("Can't lock file '") + file + "'");
 }
 
 void _debug(const char* fmt, ...)
--- a/mapson.cpp
+++ b/mapson.cpp
@@ -62,7 +62,7 @@ 
 
       fd = open(argv[i], O_RDONLY, 0);
       if (fd < 0)
-        throw system_error("Can't open file for reading");
+        throw Mapson::system_error("Can't open file for reading");
       fd_sentry sentry(fd);
       string mail;
       for (rc = read(fd, buffer, sizeof(buffer));
@@ -72,7 +72,7 @@ 
         mail.append(buffer, rc);
       }
       if (rc < 0)
-        throw system_error("Failed to read from file");
+        throw Mapson::system_error("Failed to read from file");
 
       // Extract the mail addresses.
 
@@ -196,7 +196,7 @@ 
     mail.append(buffer, rc);
   }
   if (rc < 0)
-    throw system_error("Failed to read mail from standard input");
+    throw Mapson::system_error("Failed to read mail from standard input");
 
   // Check whether the mail contains a valid cookie. If it does,
   // mail will be replaced with the original e-mail, that was
--- a/parse-config-file.cpp
+++ b/parse-config-file.cpp
@@ -55,7 +55,7 @@ 
 
   std::ifstream file(filename);
   if (!file)
-    throw system_error(std::string("parse_config_file() failed to open '") + filename + "'");
+    throw Mapson::system_error(std::string("parse_config_file() failed to open '") + filename + "'");
 
   // Now we read line by line and process each one seperately.
 
--- a/request-confirmation.cpp
+++ b/request-confirmation.cpp
@@ -157,7 +157,7 @@ 
   string filename = config->request_for_confirmation_file;
   int fd = multi_open(filename, O_RDONLY, S_IRUSR | S_IWUSR);
   if (fd < 0)
-    throw system_error(string("Can't open request-mail template file '") + filename + "' for reading");
+    throw Mapson::system_error(string("Can't open request-mail template file '") + filename + "' for reading");
   fd_sentry sentry(fd);
 
   // Read the file into memory.
@@ -167,7 +167,7 @@ 
   for (rc = read(fd, buffer, sizeof(buffer)); rc > 0; rc = read(fd, buffer, sizeof(buffer)))
     mail_template.append(buffer, rc);
   if (rc < 0)
-    throw system_error(string("Failed to read request-mail template file '") + filename + "' into memory");
+    throw Mapson::system_error(string("Failed to read request-mail template file '") + filename + "' into memory");
 
   // Expand variables in the template.
 
@@ -180,11 +180,11 @@ 
   debug(("Executing mail transport agent '%s'.", config->mta.c_str()));
   FILE* fh = popen(config->mta.c_str(), "w");
   if (fh == NULL)
-    throw system_error(string("Can't start MTA '") + config->mta + "'");
+    throw Mapson::system_error(string("Can't start MTA '") + config->mta + "'");
   if (fwrite(mail_template.data(), mail_template.size(), 1, fh) != 1)
   {
     pclose(fh);
-    throw system_error(string("Failed to pipe to MTA process '") + config->mta + "'");
+    throw Mapson::system_error(string("Failed to pipe to MTA process '") + config->mta + "'");
   }
   pclose(fh);
 }
--- a/spool.cpp
+++ b/spool.cpp
@@ -44,13 +44,13 @@ 
   info("Spooling e-mail '%s' as '%s'.", config->message_id.c_str(), filename.c_str());
   int fd = open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
   if (fd < 0)
-    throw system_error(string("Can't open spool file '") + filename + "' for writing");
+    throw Mapson::system_error(string("Can't open spool file '") + filename + "' for writing");
   fd_sentry sentry(fd);
   for (size_t len = 0; len < mail.size(); )
   {
     ssize_t rc = write(fd, mail.data()+len, mail.size()-len);
     if (rc < 0)
-      throw system_error(string("Failed writing to the spool file '") + filename + "'");
+      throw Mapson::system_error(string("Failed writing to the spool file '") + filename + "'");
     else
       len += rc;
   }
--- a/system-error.hpp
+++ b/system-error.hpp
@@ -23,6 +23,8 @@ 
 #include <string>
 #include <cstring>
 
+namespace Mapson {
+
 class system_error : public std::runtime_error
 {
 public:
@@ -43,4 +45,6 @@ 
   }
 };
 
+} // namespace Mapson
+
 #endif