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diff -rupN --no-dereference mingw-w64-v9.0.0/mingw-w64-headers/configure mingw-w64-v9.0.0-new/mingw-w64-headers/configure
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--- mingw-w64-v9.0.0/mingw-w64-headers/configure	2021-05-22 14:34:25.000000000 +0200
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+++ mingw-w64-v9.0.0-new/mingw-w64-headers/configure	2021-06-22 09:18:27.040547425 +0200
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@@ -2734,7 +2734,7 @@ printf "%s\n" "$with_widl" >&6; }
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 if test "x$with_widl" = xno
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 then :
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-
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+unset WIDL
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 else $as_nop
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   if test "x$srcdir" = x.
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diff -rupN --no-dereference mingw-w64-v9.0.0/mingw-w64-headers/configure.ac mingw-w64-v9.0.0-new/mingw-w64-headers/configure.ac
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--- mingw-w64-v9.0.0/mingw-w64-headers/configure.ac	2021-05-22 14:34:25.000000000 +0200
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+++ mingw-w64-v9.0.0-new/mingw-w64-headers/configure.ac	2021-06-22 09:18:27.041547429 +0200
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@@ -27,7 +27,7 @@ AC_ARG_WITH([widl],
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   [AS_VAR_SET([with_widl],[no])])
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 AC_MSG_RESULT([$with_widl])
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-AS_VAR_IF([with_widl],[no],[],[
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+AS_VAR_IF([with_widl],[no],[unset WIDL],[
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   AS_VAR_IF([srcdir],[.],[],
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     [AC_MSG_WARN([--with-widl used in out of the tree compilation.  Existing generated files will not be modified.])])
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   AC_PATH_PROGS([WIDL], [$host-widl widl], [], [$with_widl])