One check for sys/un.h ought to be enough. Zero checks for sys/shm.h are not.
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@ -2552,7 +2552,7 @@ mkinstalldirs="\$(SHELL) \$(top_srcdir)/config/mkinstalldirs"
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for ac_prog in mawk gawk nawk awk
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for ac_prog in gawk mawk nawk awk
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do
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# Extract the first word of "$ac_prog", so it can be a program name with args.
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set dummy $ac_prog; ac_word=$2
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@ -4298,7 +4298,7 @@ fi
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##
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## Header files
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##
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for ac_hdr in crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h netinet/tcp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/un.h sys/types.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h
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for ac_hdr in crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h netinet/tcp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/types.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h
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do
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ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
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echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
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@ -660,7 +660,7 @@ fi
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## Header files
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##
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dnl sys/socket.h and sys/types.h are required by AC_FUNC_ACCEPT_ARGTYPES
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AC_CHECK_HEADERS([crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h netinet/tcp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/un.h sys/types.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h])
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AC_CHECK_HEADERS([crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h netinet/tcp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/types.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h])
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AC_CHECK_HEADERS([readline/readline.h readline.h], [break])
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AC_CHECK_HEADERS([readline/history.h history.h], [break])
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