diff --git a/tgt-vvp/configure.in b/tgt-vvp/configure.in
index 32ca851cf..7442a0080 100644
--- a/tgt-vvp/configure.in
+++ b/tgt-vvp/configure.in
@@ -13,14 +13,21 @@ AC_CYGWIN
 AC_SUBST(CYGWIN)
 AC_CHECK_HEADERS(malloc.h)
 
-# Darwin requires -no-cpp-precomp
+# Do some operating system specific setup.
 case "${host}" in
     *-*-darwin*)
 	CPPFLAGS="-no-cpp-precomp $CPPFLAGS"
 	CFLAGS="-no-cpp-precomp $CFLAGS"
 	;;
+
+    *-*-linux*)
+	AC_DEFINE(_LARGEFILE_SOURCE)
+	AC_DEFINE(_LARGEFILE64_SOURCE)
+	;;
 esac
 
+AC_CHECK_FUNCS(fopen64)
+
 # The -fPIC flag is used to tell the compiler to make position
 # independent code. It is needed when making shared objects.
 
diff --git a/tgt-vvp/vvp.c b/tgt-vvp/vvp.c
index a5a5c877e..6e66b16fc 100644
--- a/tgt-vvp/vvp.c
+++ b/tgt-vvp/vvp.c
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: vvp.c,v 1.15 2002/08/12 01:35:03 steve Exp $"
+#ident "$Id: vvp.c,v 1.16 2003/05/16 03:22:52 steve Exp $"
 #endif
 
 /*
@@ -72,7 +72,11 @@ int target_design(ivl_design_t des)
       const char*path = ivl_design_flag(des, "-o");
       assert(path);
 
+#ifdef HAVE_FOPEN64
+      vvp_out = fopen64(path, "w");
+#else
       vvp_out = fopen(path, "w");
+#endif
       if (vvp_out == 0) {
 	    perror(path);
 	    return -1;
@@ -104,6 +108,9 @@ int target_design(ivl_design_t des)
 
 /*
  * $Log: vvp.c,v $
+ * Revision 1.16  2003/05/16 03:22:52  steve
+ *  Use fopen64 to open output file.
+ *
  * Revision 1.15  2002/08/12 01:35:03  steve
  *  conditional ident string using autoconfig.
  *