configure.ac: Add #include guard to config.h.
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@ -33,6 +33,10 @@ AC_CONFIG_HEADERS([config.h])
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AC_CONFIG_MACRO_DIR([autostuff])
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AC_CONFIG_AUX_DIR([autostuff])
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AH_TOP([#ifndef SP_CONFIG_H
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#define SP_CONFIG_H])
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AH_BOTTOM([#endif])
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# We require at least automake 1.11 (needed for 'silent rules').
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AM_INIT_AUTOMAKE([1.11 -Wall -Werror check-news])
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m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
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