diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index 5cd136922..0d1039496 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,8 +1,14 @@
-2004-07-10 Danny Smith  <dannysmith@users.sourceforge.net>
+2004-07-11  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	* include/unistd.h (ftruncate): Add inline definition.
+	* mingwex/ftruncate.c: New file.
+	* mingwex/Makefile.in: Add ftruncate.o to libmingwex.a.
+
+2004-07-10  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	* include/time.h: Do not include sys/types.h.
 
-2004-07-02 Danny Smith  <dannysmith@users.sourceforge.net>
+2004-07-02  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	* mingwex/Makefile.in (MATH_DISTFILES): Remove pow.c,
 	(MATH_OBJS): Remove pow,o.
diff --git a/winsup/mingw/include/unistd.h b/winsup/mingw/include/unistd.h
index 37682e579..f3a54495e 100644
--- a/winsup/mingw/include/unistd.h
+++ b/winsup/mingw/include/unistd.h
@@ -14,4 +14,20 @@
 #include <getopt.h>
 #undef __UNISTD_GETOPT__
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This is defined as a real library function to allow autoconf
+   to verify its existence. */
+int ftruncate(int, off_t);
+__CRT_INLINE int ftruncate(int __fd, off_t __length)
+{
+  return _chsize (__fd, __length);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _UNISTD_H */
diff --git a/winsup/mingw/mingwex/Makefile.in b/winsup/mingw/mingwex/Makefile.in
index 6853ca32d..1369de60d 100644
--- a/winsup/mingw/mingwex/Makefile.in
+++ b/winsup/mingw/mingwex/Makefile.in
@@ -29,8 +29,8 @@ DISTFILES = Makefile.in configure configure.in \
 	_Exit.c atoll.c dirent.c feclearexcept.c fegetenv.c \
 	fegetexceptflag.c fegetround.c feholdexcept.c feraiseexcept.c \
 	fesetenv.c fesetexceptflag.c fesetround.c fetestexcept.c \
-	feupdateenv.c fwide.c  getopt.c imaxabs.c imaxdiv.c ldtoa.c \
-	lltoa.c lltow.c mbsinit.c mingw-fseek.c sitest.c strtof.c \
+	feupdateenv.c ftruncate.c fwide.c  getopt.c imaxabs.c imaxdiv.c \
+	ldtoa.c lltoa.c lltow.c mbsinit.c mingw-fseek.c sitest.c strtof.c \
 	strtoimax.c strtold.c strtoumax.c testwmem.c ulltoa.c ulltow.c \
 	wcstof.c wcstoimax.c wcstold.c wcstoumax.c wdirent.c wmemchr.c \
 	wmemcmp.c wmemcpy.c wmemmove.c wmemset.c wtoll.c
@@ -147,7 +147,7 @@ FENV_OBJS = fesetround.o  fegetround.o \
 	feclearexcept.o feholdexcept.o fegetexceptflag.o \
 	feraiseexcept.o fetestexcept.o fesetexceptflag.o
 POSIX_OBJS = \
-	dirent.o wdirent.o getopt.o
+	dirent.o wdirent.o getopt.o ftruncate.o
 REPLACE_OBJS = \
 	mingw-fseek.o
 COMPLEX_OBJS = \
diff --git a/winsup/mingw/mingwex/ftruncate.c b/winsup/mingw/mingwex/ftruncate.c
new file mode 100755
index 000000000..fdb62951a
--- /dev/null
+++ b/winsup/mingw/mingwex/ftruncate.c
@@ -0,0 +1,5 @@
+#include <unistd.h>
+int ftruncate(int __fd, off_t __length)
+{
+  return _chsize (__fd, __length);
+}