diff --git a/lang/cem/libcc.ansi/headers/ack/config.h b/lang/cem/libcc.ansi/headers/ack/config.h
index 41e9bc3b6..cf8f5d835 100644
--- a/lang/cem/libcc.ansi/headers/ack/config.h
+++ b/lang/cem/libcc.ansi/headers/ack/config.h
@@ -15,6 +15,10 @@
 #define ACKCONF_WANT_STANDARD_O 1
 #endif
 
+#ifndef ACKCONF_WANT_O_TEXT_O_BINARY
+#define ACKCONF_WANT_O_TEXT_O_BINARY 0
+#endif
+
 #ifndef ACKCONF_WANT_STANDARD_SIGNALS
 #define ACKCONF_WANT_STANDARD_SIGNALS 1
 #endif
diff --git a/lang/cem/libcc.ansi/headers/ack/emufile.h b/lang/cem/libcc.ansi/headers/ack/emufile.h
index 06a1ffcec..158ec58a8 100644
--- a/lang/cem/libcc.ansi/headers/ack/emufile.h
+++ b/lang/cem/libcc.ansi/headers/ack/emufile.h
@@ -24,6 +24,7 @@ struct FILE {
 #define	_IOREADING	0x080
 #define _IOWRITING	0x100
 #define	_IOAPPEND	0x200
+#define _IOBINARY	0x400
 
 #if !defined BUFSIZ
 #define	BUFSIZ      1024
diff --git a/lang/cem/libcc.ansi/headers/unistd.h b/lang/cem/libcc.ansi/headers/unistd.h
index bab5ada71..a316132d2 100644
--- a/lang/cem/libcc.ansi/headers/unistd.h
+++ b/lang/cem/libcc.ansi/headers/unistd.h
@@ -24,6 +24,10 @@
         O_WRONLY = 1,
         O_RDWR = 2,
         
+    #if ACKCONF_WANT_O_TEXT_O_BINARY
+        O_TEXT = 010000,
+        O_BINARY = 020000,
+    #endif
         O_CREAT = 0100,
         O_TRUNC = 01000,
         O_APPEND = 02000,
diff --git a/lang/cem/libcc.ansi/sys/stdio/fdopen.c b/lang/cem/libcc.ansi/sys/stdio/fdopen.c
index aff7d248e..58fcecfcd 100644
--- a/lang/cem/libcc.ansi/sys/stdio/fdopen.c
+++ b/lang/cem/libcc.ansi/sys/stdio/fdopen.c
@@ -5,6 +5,10 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#if ACKCONF_WANT_O_TEXT_O_BINARY
+    #include <unistd.h>
+    #include <fcntl.h>
+#endif
 
 #if ACKCONF_WANT_STDIO && ACKCONF_WANT_EMULATED_FILE
 
@@ -38,6 +42,9 @@ FILE* fdopen(int fd, const char* mode)
 		switch (*mode++)
 		{
 			case 'b':
+#if ACKCONF_WANT_O_TEXT_O_BINARY
+				flags |= _IOBINARY;
+#endif
 				continue;
 			case '+':
 				flags |= _IOREAD | _IOWRITE;
@@ -57,6 +64,17 @@ FILE* fdopen(int fd, const char* mode)
 	if ((flags & _IOREAD) && (flags & _IOWRITE))
 		flags &= ~(_IOREADING | _IOWRITING);
 
+#if ACKCONF_WANT_O_TEXT_O_BINARY
+	{
+		/*
+		 * FIXME: this assumes that any platform that has O_TEXT and
+		 * O_BINARY will also have a _setmode() function.
+		 */
+		extern int _setmode(int, int);
+		_setmode(fd, (flags & _IOBINARY) ? O_BINARY : O_TEXT);
+	}
+#endif
+
 	stream->_count = 0;
 	stream->_fd = fd;
 	stream->_flags = flags;
diff --git a/lang/cem/libcc.ansi/sys/stdio/fopen.c b/lang/cem/libcc.ansi/sys/stdio/fopen.c
index f2189ee8f..cfea44154 100644
--- a/lang/cem/libcc.ansi/sys/stdio/fopen.c
+++ b/lang/cem/libcc.ansi/sys/stdio/fopen.c
@@ -7,7 +7,6 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
-#include <unistd.h>
 
 #if ACKCONF_WANT_STDIO && ACKCONF_WANT_EMULATED_FILE
 
@@ -68,6 +67,9 @@ FILE* fopen(const char* name, const char* mode)
 		switch (*mode++)
 		{
 			case 'b':
+#if ACKCONF_WANT_O_TEXT_O_BINARY
+				flags |= _IOBINARY;
+#endif
 				continue;
 			case '+':
 				rwmode = O_RDWR;
@@ -80,6 +82,7 @@ FILE* fopen(const char* name, const char* mode)
 		break;
 	}
 
+#if !ACKCONF_WANT_O_TEXT_O_BINARY
 	/* Perform a creat() when the file should be truncated or when
 	 * the file is opened for writing and the open() failed.
 	 */
@@ -87,12 +90,16 @@ FILE* fopen(const char* name, const char* mode)
 	    || (((fd = open(name, rwmode)) < 0)
 	           && (rwflags & O_CREAT)))
 	{
-		if (((fd = creat(name, PMODE)) > 0) && flags | _IOREAD)
+		if (((fd = creat(name, PMODE)) >= 0) && (flags & _IOREAD))
 		{
 			(void)close(fd);
 			fd = open(name, rwmode);
 		}
 	}
+#else
+	rwflags |= (flags & _IOBINARY) ? O_BINARY : O_TEXT;
+	fd = open(name, rwmode | rwflags, PMODE);
+#endif
 
 	if (fd < 0)
 		return (FILE*)NULL;
diff --git a/lang/cem/libcc.ansi/sys/stdio/freopen.c b/lang/cem/libcc.ansi/sys/stdio/freopen.c
index 846208420..1ae5befe0 100644
--- a/lang/cem/libcc.ansi/sys/stdio/freopen.c
+++ b/lang/cem/libcc.ansi/sys/stdio/freopen.c
@@ -50,6 +50,9 @@ FILE* freopen(const char* name, const char* mode, FILE* stream)
 		switch (*mode++)
 		{
 			case 'b':
+#if ACKCONF_WANT_O_TEXT_O_BINARY
+				flags |= _IOBINARY;
+#endif
 				continue;
 			case '+':
 				rwmode = O_RDWR;
@@ -62,16 +65,21 @@ FILE* freopen(const char* name, const char* mode, FILE* stream)
 		break;
 	}
 
+#if !ACKCONF_WANT_O_TEXT_O_BINARY
 	if ((rwflags & O_TRUNC)
 	    || (((fd = open(name, rwmode)) < 0)
 	           && (rwflags & O_CREAT)))
 	{
-		if (((fd = creat(name, PMODE)) < 0) && flags | _IOREAD)
+		if (((fd = creat(name, PMODE)) >= 0) && (flags & _IOREAD))
 		{
 			(void)close(fd);
 			fd = open(name, rwmode);
 		}
 	}
+#else
+	rwflags |= (flags & _IOBINARY) ? O_BINARY : O_TEXT;
+	fd = open(name, rwmode | rwflags, PMODE);
+#endif
 
 	if (fd < 0)
 	{