diff --git a/src/core/platform.h b/src/core/platform.h
index 0dd62ce..7a5ffcf 100644
--- a/src/core/platform.h
+++ b/src/core/platform.h
@@ -80,6 +80,7 @@
 #define OS_MINT         0x0507
 #define OS_AROS         0x0508
 #define OS_RTEMS        0x0509   
+#define OS_RISCOS       0x050A
 
 #define COMP_UNKNOWN        0
 #define COMP_GCC            0x0001
@@ -209,14 +210,15 @@
 #elif defined(__AROS__)
     #define OS                  OS_AROS
     #define IS_AROS             1 
-		
+	
 #elif defined(__rtems__)
     #define OS                  OS_RTEMS
     #define IS_RTEMS            1
 
-#else
-//  OK for OS not to resolve, it's being phased out.
-//    #error Unknown OS
+#elif defined(__riscos__)
+    #define OS                  OS_RISCOS
+    #define IS_RISCOS           1
+
 #endif
 	
 	
@@ -300,7 +302,7 @@
 #define SUPPORTS_ST_BLOCKS          (!IS_DOS_DJGPP)
 #define SUPPORTS_POSIX_SIGNALS      (!IS_DOS_DJGPP)
 #define SUPPORTS_NETWORKING         (!IS_SORTIX && !IS_DOS_DJGPP)
-#define SUPPORTS_SYSLOG             (HAVE_SYSLOG_H && !IS_SKYOS)
+#define SUPPORTS_SYSLOG             (HAVE_SYSLOG_H && !IS_SKYOS && !IS_RISCOS)
 #define NEEDS_SWAB_IMPL             (IS_SYLLABLE || IS_ANDROID || IS_SORTIX)
 #define USES_MBLEN                  (!IS_ANDROID && !IS_AROS)
 #define USES_DEVICE_PATH            (IS_AROS || IS_DOS_DJGPP)
diff --git a/src/core/unixfsservices.cpp b/src/core/unixfsservices.cpp
index 934196f..0f91d1e 100644
--- a/src/core/unixfsservices.cpp
+++ b/src/core/unixfsservices.cpp
@@ -368,7 +368,7 @@ void cUnixFSServices::Stat( const TSTRING& strNameC, cFSStatArgs& stat) const
 #ifdef S_IFDOOR
     else if(S_ISDOOR(statbuf.st_mode))  stat.mFileType = cFSStatArgs::TY_DOOR;
 #endif
-#ifdef S_IFPORT
+#ifdef S_ISPORT
     else if(S_ISPORT(statbuf.st_mode))  stat.mFileType = cFSStatArgs::TY_PORT;
 #endif
     
@@ -599,7 +599,7 @@ void cUnixFSServices::ConvertModeToString( uint64 perm, TSTRING& tstrPerm ) cons
             szPerm[0] = _T('D');
             break;
 #endif
-#ifdef S_IFPORT
+#ifdef S_ISPORT
         case S_IFPORT:
             szPerm[0] = _T('P');
             break;
diff --git a/src/twtest/fcocompare_t.cpp b/src/twtest/fcocompare_t.cpp
index 686665e..f4580ba 100644
--- a/src/twtest/fcocompare_t.cpp
+++ b/src/twtest/fcocompare_t.cpp
@@ -69,7 +69,7 @@ void TestFCOCompare()
 
     // first, create an fco to compare with...
     
-    TOFSTREAM fstr(filename);
+    TOFSTREAM fstr(filename.c_str());
     if(fstr.bad())
     {
         d.TraceError("Unable to create test file %s!\n", filename.c_str());
@@ -109,7 +109,7 @@ void TestFCOCompare()
 
     // change the file...
     d.TraceDebug("Changing the file...\n");
-    fstr.open(filename);
+    fstr.open(filename.c_str());
     if(fstr.bad())
     {
         d.TraceError("Unable to reopen %s!\n", filename.c_str());
diff --git a/src/twtest/tchar_t.cpp b/src/twtest/tchar_t.cpp
index 36006d6..9bcc5d0 100644
--- a/src/twtest/tchar_t.cpp
+++ b/src/twtest/tchar_t.cpp
@@ -94,16 +94,16 @@ void TestTCHAR()
 
     //Set up the input file.
     TOFSTREAM out;
-    out.open(inputfile, std::ios_base::out);
+    out.open(inputfile.c_str(), std::ios_base::out);
     out<<"Unicode is fun\n";
     out.close();
 
     TIFSTREAM from;
-    from.open(inputfile, std::ios_base::in);
+    from.open(inputfile.c_str(), std::ios_base::in);
     if(!from)
         d.TraceDetail("error opening input file\n");
 
-    TOFSTREAM to(outputfile, std::ios_base::trunc);
+    TOFSTREAM to(outputfile.c_str(), std::ios_base::trunc);
     if(!to)
         d.TraceDetail("error opening output file\n");