4 files changed, 16 insertions, 3 deletions
diff --git a/generic/tclMain.c b/generic/tclMain.c
index 360f5e9..c2300c2 100644
--- a/generic/tclMain.c
+++ b/generic/tclMain.c
@@ -80,7 +80,10 @@ NewNativeObj(
  * 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
 
 /*
  * The thread-local variables for this file's functions.
diff --git a/unix/tclUnixFile.c b/unix/tclUnixFile.c
index 2cb0027..7ffbf8d 100644
--- a/unix/tclUnixFile.c
+++ b/unix/tclUnixFile.c
@@ -155,6 +155,11 @@ TclpFindExecutable(
 	goto done;
     }
 
+    if (TclpGetCwd(NULL, &cwd) == NULL) {
+	TclSetObjNameOfExecutable(Tcl_NewObj(), NULL);
+	goto done;
+    }
+
     /*
      * The name is relative to the current working directory. First strip off
      * a leading "./", if any, then add the full path name of the current
@@ -168,8 +173,6 @@ TclpFindExecutable(
     Tcl_DStringInit(&nameString);
     Tcl_DStringAppend(&nameString, name, -1);
 
-    TclpGetCwd(NULL, &cwd);
-
     Tcl_DStringFree(&buffer);
     Tcl_UtfToExternalDString(NULL, Tcl_DStringValue(&cwd),
 	    Tcl_DStringLength(&cwd), &buffer);
diff --git a/win/makefile.vc b/win/makefile.vc
index be05e73..024ecb0 100644
--- a/win/makefile.vc
+++ b/win/makefile.vc
@@ -530,6 +530,10 @@ lflags	= -nologo -machine:$(MACHINE) $(LINKERFLAGS) $(ldebug)
 lflags	= $(lflags) -profile
 !endif
 
+!if $(MSVCRT) && !($(DEBUG) && !$(UNCHECKED)) && $(VCVERSION) >= 1900
+lflags	= $(lflags) -nodefaultlib:libucrt.lib
+!endif
+
 !if $(ALIGN98_HACK) && !$(STATIC_BUILD)
 ### Align sections for PE size savings.
 lflags	= $(lflags) -opt:nowin98
@@ -554,6 +558,9 @@ baselibs   = netapi32.lib kernel32.lib user32.lib advapi32.lib ws2_32.lib
 baselibs   = $(baselibs) bufferoverflowU.lib
 !endif
 !endif
+!if $(MSVCRT) && !($(DEBUG) && !$(UNCHECKED)) && $(VCVERSION) >= 1900
+baselibs   = $(baselibs) ucrt.lib
+!endif
 
 #---------------------------------------------------------------------
 # TclTest flags
diff --git a/win/tclWinFile.c b/win/tclWinFile.c
index 6b9d373..02927ad 100755
--- a/win/tclWinFile.c
+++ b/win/tclWinFile.c
@@ -3001,7 +3001,7 @@ TclNativeCreateNativeRep(
     }
 
   done:
-    
+
     TclDecrRefCount(validPathPtr);
     return nativePathPtr;
 }