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@@ -270,7 +270,7 @@ AC_DEFUN([BIND10_CXX_TRY_FLAG], [
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bind10_save_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $1"
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- AC_LINK_IFELSE([int main(void){ return 0;}],
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+ AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void){ return 0;}])],
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[bind10_cxx_flag=yes], [bind10_cxx_flag=no])
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CXXFLAGS="$bind10_save_CXXFLAGS"
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