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--- mingw-w64-headers/configure.ac.orig	2014-03-30 15:23:08.248186613 +0200
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+++ mingw-w64-headers/configure.ac	2014-03-30 15:24:15.775316204 +0200
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@@ -27,7 +27,7 @@
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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])
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--- mingw-w64-headers/configure.orig	2014-03-30 15:24:23.969453233 +0200
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+++ mingw-w64-headers/configure	2014-03-30 15:24:26.479495205 +0200
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@@ -2565,7 +2473,7 @@
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 $as_echo "$with_widl" >&6; }
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 if test "x$with_widl" = xno; then :
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-
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+  unset WIDL
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 else
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   if test "x$srcdir" = x.; then :