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configure.ac: Silence a warning from Autoconf 2.68.
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@ -579,7 +579,7 @@ if test "$GCC" = yes ; then
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AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
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OLD_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $NEW_FLAG"
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AC_COMPILE_IFELSE([void foo(void) { }], [
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([void foo(void) { }])], [
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AM_CFLAGS="$AM_CFLAGS $NEW_FLAG"
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AC_MSG_RESULT([yes])
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], [
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