updated for version 7.4.183
Problem:    MSVC Visual Studio update not supported.
Solution:   Add version number. (Mike William)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 6718e14..ab02890 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -424,6 +424,9 @@
 !if "$(_NMAKE_VER)" == "11.00.60610.1"
 MSVCVER = 11.0
 !endif
+!if "$(_NMAKE_VER)" == "11.00.61030.0"
+MSVCVER = 11.0
+!endif
 !if "$(_NMAKE_VER)" == "12.00.21005.1"
 MSVCVER = 12.0
 !endif