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-rw-r--r--generic/tclMain.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/generic/tclMain.c b/generic/tclMain.c
index 5e5109b..b2206f8 100644
--- a/generic/tclMain.c
+++ b/generic/tclMain.c
@@ -28,7 +28,10 @@
* source directory to make their own modified versions).
*/
+#if defined _MSC_VER && _MSC_VER < 1900
+/* isatty is always defined on MSVC 14.0, but not necessarily as CRTIMPORT. */
extern CRTIMPORT int isatty(int fd);
+#endif
static Tcl_Obj *tclStartupScriptPath = NULL;
static Tcl_Obj *tclStartupScriptEncoding = NULL;