--- a/make/autoconf/toolchain_windows.m4	Fri Oct 11 06:31:52 2019 -0700
+++ b/make/autoconf/toolchain_windows.m4	Fri Oct 11 06:57:33 2019 -0700
@@ -209,6 +209,8 @@
   eval SDK_INSTALL_DIR="\${VS_SDK_INSTALLDIR_${VS_VERSION}}"
   eval VS_ENV_ARGS="\${VS_ENV_ARGS_${VS_VERSION}}"
   eval VS_TOOLSET_SUPPORTED="\${VS_TOOLSET_SUPPORTED_${VS_VERSION}}"
+    
+  VS_ENV_CMD="" 
 
   # When using --with-tools-dir, assume it points to the correct and default
   # version of Visual Studio or that --with-toolchain-version was also set.
@@ -227,8 +229,6 @@
     fi
   fi
 
-  VS_ENV_CMD=""
-
   if test "x$VS_COMNTOOLS" != x; then
     TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT([${VS_VERSION}],
         [$VS_COMNTOOLS/../..], [$VS_COMNTOOLS_VAR variable])