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+dnl $Id$
+
+dnl Copyright 1996 by the Massachusetts Institute of Technology.
+dnl
+dnl Permission to use, copy, modify, and distribute this
+dnl software and its documentation for any purpose and without
+dnl fee is hereby granted, provided that the above copyright
+dnl notice appear in all copies and that both that copyright
+dnl notice and this permission notice appear in supporting
+dnl documentation, and that the name of M.I.T. not be used in
+dnl advertising or publicity pertaining to distribution of the
+dnl software without specific, written prior permission.
+dnl M.I.T. makes no representations about the suitability of
+dnl this software for any purpose.  It is provided "as is"
+dnl without express or implied warranty.
+
+dnl This file provides local macros for packages which use specific
+dnl external libraries.  The public macros are:
+dnl
+dnl	ATHENA_UTIL_COM_ERR
+dnl		Generates error if com_err not found.
+dnl	ATHENA_UTIL_SS
+dnl		Generates error if ss not found.
+dnl	ATHENA_REGEXP
+dnl		Sets REGEX_LIBS if rx library used; ensures POSIX
+dnl		regexp support.
+dnl	ATHENA_MOTIF
+dnl		Sets MOTIF_LIBS and defines HAVE_MOTIF if Motif used.
+dnl	ATHENA_MOTIF_REQUIRED
+dnl		Generates error if Motif not found.
+dnl	ATHENA_AFS
+dnl		Sets AFS_LIBS and defines HAVE_AFS if AFS used.  Pass
+dnl		in an argument giving the desired AFS libraries;
+dnl		AFS_LIBS will be set to that value if AFS is found.
+dnl		AFS_DIR will be set to the prefix given.
+dnl	ATHENA_AFS_REQUIRED
+dnl		Generates error if AFS libraries not found.  AFS_DIR
+dnl		will be set to the prefix given.
+dnl	ATHENA_KRB4
+dnl		Sets KRB4_LIBS and defines HAVE_KRB4 if krb4 used.
+dnl	ATHENA_KRB4_REQUIRED
+dnl		Generates error if krb4 not found.  Sets KRB4_LIBS
+dnl		otherwise.  (Special behavior because krb4 libraries
+dnl		may be different if using krb4 compatibility libraries
+dnl		from krb5.)
+dnl	ATHENA_KRB5
+dnl		Sets KRB5_LIBS and defines HAVE_KRB5 if krb5 used.
+dnl	ATHENA_KRB5_REQUIRED
+dnl		Generates error if krb5 not found.
+dnl	ATHENA_HESIOD
+dnl		Sets HESIOD_LIBS and defines HAVE_HESIOD if Hesiod
+dnl		used.
+dnl	ATHENA_HESIOD_REQUIRED
+dnl		Generates error if Hesiod not found.
+dnl	ATHENA_ARES
+dnl		Sets ARES_LIBS and defines HAVE_ARES if libares
+dnl		used.
+dnl	ATHENA_ARES_REQUIRED
+dnl		Generates error if libares not found.
+dnl	ATHENA_ZEPHYR
+dnl		Sets ZEPHYR_LIBS and defines HAVE_ZEPHYR if zephyr
+dnl		used.
+dnl	ATHENA_ZEPHYR_REQUIRED
+dnl		Generates error if zephyr not found.
+dnl
+dnl All of the macros may extend CPPFLAGS and LDFLAGS to let the
+dnl compiler find the requested libraries.  Put ATHENA_UTIL_COM_ERR
+dnl and ATHENA_UTIL_SS before ATHENA_AFS or ATHENA_AFS_REQUIRED; there
+dnl is a com_err library in the AFS libraries which requires -lutil.
+
+dnl ----- com_err -----
+
+AC_DEFUN(ATHENA_UTIL_COM_ERR,
+[AC_ARG_WITH(com_err,
+	[  --with-com_err=PREFIX   Specify location of com_err],
+	[com_err="$withval"], [com_err=yes])
+if test "$com_err" != no; then
+	if test "$com_err" != yes; then
+		CPPFLAGS="$CPPFLAGS -I$com_err/include"
+		LDFLAGS="$LDFLAGS -L$com_err/lib"
+	fi
+	AC_CHECK_LIB(com_err, com_err, :,
+		     [AC_MSG_ERROR(com_err library not found)])
+else
+	AC_MSG_ERROR(This package requires com_err.)
+fi])
+
+dnl ----- ss -----
+
+AC_DEFUN(ATHENA_UTIL_SS,
+[AC_ARG_WITH(ss,
+	[  --with-ss=PREFIX        Specify location of ss (requires com_err)],
+	[ss="$withval"], [ss=yes])
+if test "$ss" != no; then
+	if test "$ss" != yes; then
+		CPPFLAGS="$CPPFLAGS -I$ss/include"
+		LDFLAGS="$LDFLAGS -L$ss/lib"
+	fi
+	AC_CHECK_LIB(ss, ss_perror, :,
+		     [AC_MSG_ERROR(ss library not found)], -lcom_err)
+else
+	AC_MSG_ERROR(This package requires ss.)
+fi])
+
+dnl ----- Regular expressions -----
+
+AC_DEFUN(ATHENA_REGEXP,
+[AC_ARG_WITH(regex,
+	[  --with-regex=PREFIX     Use installed regex library],
+	[regex="$withval"], [regex=no])
+if test "$regex" != no; then
+	if test "$regex" != yes; then
+		CPPFLAGS="$CPPFLAGS -I$regex/include"
+		LDFLAGS="$LDFLAGS -L$regex/lib"
+	fi
+	AC_CHECK_LIB(regex, regcomp, REGEX_LIBS=-lregex,
+		     [AC_MSG_ERROR(regex library not found)])
+else
+	AC_CHECK_FUNC(regcomp, :,
+		      [AC_MSG_ERROR(can't find POSIX regexp support)])
+fi
+AC_SUBST(REGEX_LIBS)])
+
+dnl ----- Motif -----
+
+AC_DEFUN(ATHENA_MOTIF_CHECK,
+[if test "$motif" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$motif/include"
+	LDFLAGS="$LDFLAGS -L$motif/lib"
+fi
+AC_CHECK_LIB(Xm, XmStringFree, :, [AC_MSG_ERROR(Motif library not found)])])
+
+AC_DEFUN(ATHENA_MOTIF,
+[AC_ARG_WITH(motif,
+	[  --with-motif=PREFIX     Use Motif],
+	[motif="$withval"], [motif=no])
+if test "$motif" != no; then
+	ATHENA_MOTIF_CHECK
+	MOTIF_LIBS=-lXm
+	AC_DEFINE(HAVE_MOTIF)
+fi
+AC_SUBST(MOTIF_LIBS)])
+
+AC_DEFUN(ATHENA_MOTIF_REQUIRED,
+[AC_ARG_WITH(motif,
+	[  --with-motif=PREFIX     Specify location of Motif],
+	[motif="$withval"], [motif=yes])
+if test "$motif" != no; then
+	ATHENA_MOTIF_CHECK
+else
+	AC_MSG_ERROR(This package requires Motif.)
+fi])
+
+dnl ----- AFS -----
+
+AC_DEFUN(ATHENA_AFS_CHECK,
+[AC_CHECK_FUNC(insque, :, AC_CHECK_LIB(compat, insque))
+AC_CHECK_FUNC(gethostbyname, :, AC_CHECK_LIB(nsl, gethostbyname))
+AC_CHECK_FUNC(socket, :, AC_CHECK_LIB(socket, socket))
+if test "$afs" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$afs/include"
+	LDFLAGS="$LDFLAGS -L$afs/lib -L$afs/lib/afs"
+fi
+AC_CHECK_LIB(sys, pioctl, :, [AC_MSG_ERROR(AFS libraries not found)],
+	     -lrx -llwp -lsys)
+AFS_DIR=$afs
+AC_SUBST(AFS_DIR)])
+
+dnl Specify desired AFS libraries as a parameter.
+AC_DEFUN(ATHENA_AFS,
+[AC_ARG_WITH(afs,
+	[  --with-afs=PREFIX       Use AFS libraries],
+	[afs="$withval"], [afs=no])
+if test "$afs" != no; then
+	ATHENA_AFS_CHECK
+	AFS_LIBS=$1
+	AC_DEFINE(HAVE_AFS)
+fi
+AC_SUBST(AFS_LIBS)])
+
+AC_DEFUN(ATHENA_AFS_REQUIRED,
+[AC_ARG_WITH(afs,
+	[  --with-afs=PREFIX       Specify location of AFS libraries],
+	[afs="$withval"], [afs=/usr/afsws])
+if test "$afs" != no; then
+	ATHENA_AFS_CHECK
+else
+	AC_MSG_ERROR(This package requires AFS libraries.)
+fi])
+
+dnl ----- Kerberos 4 -----
+
+AC_DEFUN(ATHENA_KRB4_CHECK,
+[AC_CHECK_FUNC(gethostbyname, :, AC_CHECK_LIB(nsl, gethostbyname))
+AC_CHECK_FUNC(socket, :, AC_CHECK_LIB(socket, socket))
+AC_CHECK_LIB(gen, compile)
+if test "$krb4" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$krb4/include"
+	if test -d "$krb4/include/kerberosIV"; then
+		CPPFLAGS="$CPPFLAGS -I$krb4/include/kerberosIV"
+	fi
+	LDFLAGS="$LDFLAGS -L$krb4/lib"
+fi
+AC_CHECK_LIB(krb4, krb_rd_req,
+	     [KRB4_LIBS="-lkrb4 -ldes425 -lkrb5 -lk5crypto -lcom_err"],
+	     [AC_CHECK_LIB(krb, krb_rd_req,
+			   [KRB4_LIBS="-lkrb -ldes"],
+			   [AC_MSG_ERROR(Kerberos 4 libraries not found)],
+			   -ldes)],
+	     -ldes425 -lkrb5 -lk5crypto -lcom_err)])
+
+AC_DEFUN(ATHENA_KRB4,
+[AC_ARG_WITH(krb4,
+	[  --with-krb4=PREFIX      Use Kerberos 4],
+	[krb4="$withval"], [krb4=no])
+if test "$krb4" != no; then
+	ATHENA_KRB4_CHECK
+	AC_DEFINE(HAVE_KRB4)
+fi
+AC_SUBST(KRB4_LIBS)])
+
+AC_DEFUN(ATHENA_KRB4_REQUIRED,
+[AC_ARG_WITH(krb4,
+	[  --with-krb4=PREFIX      Specify location of Kerberos 4],
+	[krb4="$withval"], [krb4=yes])
+if test "$krb4" != no; then
+	ATHENA_KRB4_CHECK
+	AC_SUBST(KRB4_LIBS)
+else
+	AC_MSG_ERROR(This package requires Kerberos 4.)
+fi])
+
+dnl ----- Kerberos 5 -----
+
+AC_DEFUN(ATHENA_KRB5_CHECK,
+[AC_SEARCH_LIBS(gethostbyname, nsl)
+AC_SEARCH_LIBS(socket, socket)
+AC_CHECK_LIB(gen, compile)
+if test "$krb5" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$krb5/include"
+	LDFLAGS="$LDFLAGS -L$krb5/lib"
+fi
+AC_CHECK_LIB(krb5, krb5_init_context, :,
+	     [AC_MSG_ERROR(Kerberos 5 libraries not found)],
+	     -lk5crypto -lcom_err)])
+
+AC_DEFUN(ATHENA_KRB5,
+[AC_ARG_WITH(krb5,
+	[  --with-krb5=PREFIX      Use Kerberos 5],
+	[krb5="$withval"], [krb5=no])
+if test "$krb5" != no; then
+	ATHENA_KRB5_CHECK
+	KRB5_LIBS="-lkrb5 -lk5crypto -lcom_err"
+	AC_DEFINE(HAVE_KRB5)
+fi
+AC_SUBST(KRB5_LIBS)])
+
+AC_DEFUN(ATHENA_KRB5_REQUIRED,
+[AC_ARG_WITH(krb5,
+	[  --with-krb5=PREFIX      Specify location of Kerberos 5],
+	[krb5="$withval"], [krb5=yes])
+if test "$krb5" != no; then
+	ATHENA_KRB5_CHECK
+else
+	AC_MSG_ERROR(This package requires Kerberos 5.)
+fi])
+
+dnl ----- Hesiod -----
+
+AC_DEFUN(ATHENA_HESIOD_CHECK,
+[AC_CHECK_FUNC(res_send, :, AC_CHECK_LIB(resolv, res_send))
+if test "$hesiod" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$hesiod/include"
+	LDFLAGS="$LDFLAGS -L$hesiod/lib"
+fi
+AC_CHECK_LIB(hesiod, hes_resolve, :,
+	     [AC_MSG_ERROR(Hesiod library not found)])])
+
+AC_DEFUN(ATHENA_HESIOD,
+[AC_ARG_WITH(hesiod,
+	[  --with-hesiod=PREFIX    Use Hesiod],
+	[hesiod="$withval"], [hesiod=no])
+if test "$hesiod" != no; then
+	ATHENA_HESIOD_CHECK
+	HESIOD_LIBS="-lhesiod"
+	AC_DEFINE(HAVE_HESIOD)
+fi
+AC_SUBST(HESIOD_LIBS)])
+
+AC_DEFUN(ATHENA_HESIOD_REQUIRED,
+[AC_ARG_WITH(hesiod,
+	[  --with-hesiod=PREFIX    Specify location of Hesiod],
+	[hesiod="$withval"], [hesiod=yes])
+if test "$hesiod" != no; then
+	ATHENA_HESIOD_CHECK
+else
+	AC_MSG_ERROR(This package requires Hesiod.)
+fi])
+
+dnl ----- libares -----
+
+AC_DEFUN(ATHENA_ARES_CHECK,
+[AC_CHECK_FUNC(res_send, :, AC_CHECK_LIB(resolv, res_send))
+if test "$ares" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$ares/include"
+	LDFLAGS="$LDFLAGS -L$ares/lib"
+fi
+AC_CHECK_LIB(ares, ares_init, :, [AC_MSG_ERROR(libares not found)])])
+
+AC_DEFUN(ATHENA_ARES,
+[AC_ARG_WITH(ares,
+	[  --with-ares=PREFIX      Use libares],
+	[ares="$withval"], [ares=no])
+if test "$ares" != no; then
+	ATHENA_ARES_CHECK
+	ARES_LIBS="-lares"
+	AC_DEFINE(HAVE_ARES)
+fi
+AC_SUBST(ARES_LIBS)])
+
+AC_DEFUN(ATHENA_ARES_REQUIRED,
+[AC_ARG_WITH(ares,
+	[  --with-ares=PREFIX      Specify location of libares],
+	[ares="$withval"], [ares=yes])
+if test "$ares" != no; then
+	ATHENA_ARES_CHECK
+else
+	AC_MSG_ERROR(This package requires libares.)
+fi])
+dnl ----- zephyr -----
+
+AC_DEFUN(ATHENA_ZEPHYR_CHECK,
+[if test "$zephyr" != yes; then
+	CPPFLAGS="$CPPFLAGS -I$zephyr/include"
+	LDFLAGS="$LDFLAGS -L$zephyr/lib"
+fi
+AC_CHECK_LIB(zephyr, ZFreeNotice, :, [AC_MSG_ERROR(zephyr not found)])])
+
+AC_DEFUN(ATHENA_ZEPHYR,
+[AC_ARG_WITH(zephyr,
+	[  --with-zephyr=PREFIX      Use zephyr],
+	[zephyr="$withval"], [zephyr=no])
+if test "$zephyr" != no; then
+	ATHENA_ZEPHYR_CHECK
+	ZEPHYR_LIBS="-lzephyr"
+	AC_DEFINE(HAVE_ZEPHYR)
+fi
+AC_SUBST(ZEPHYR_LIBS)])
+
+AC_DEFUN(ATHENA_ZEPHYR_REQUIRED,
+[AC_ARG_WITH(zephyr,
+	[  --with-zephyr=PREFIX      Specify location of zephyr],
+	[zephyr="$withval"], [zephyr=yes])
+if test "$zephyr" != no; then
+	ATHENA_ZEPHYR_CHECK
+else
+	AC_MSG_ERROR(This package requires zephyr.)
+fi])