Fix several linking issues

* configure.ac: Require libtool version 2.4.6
(MU_LINK_POSTFLAGS): Remove.  Not needed with the patched version
of ltmain.sh.
Detect the presencecof GSSAPI.
Fix displaying the status of GSSAPI support.
Remove the hack introduced on 2010-02-19 (commit 35ac66f056).
(MU_AUTHLIBS,SQLLIB)
(SQL_LOADABLE_MODULES,SQL_LIBOBJS): Insert spaces only when needed.

* mu-aux/ltmain.sh: ltmain.sh from libtool 2.4.6 with fixes from
http://gray.gnu.org.ua/public/ltbug installed.
* bootstrap.conf (bootstrap_epilogue): Install the fixed ltmain.sh
version.

* am/gssapi.m4: Allow for "yes" and "probe" argument values.

Improve makefile style consistency

 . Uniformly use parentheses instead of curly braces in variable
   referencing;
 . Prefer to use Make variables over substitution variables, for
   variables prefixed with MU_;

* comsat/Makefile.am
* dotlock/Makefile.am
* examples/Makefile.am
* examples/cpp/Makefile.am
* frm/Makefile.am
* imap4d/Makefile.am
* imap4d/tests/Makefile.am
* lib/Makefile.am
* libmailutils/Makefile.am
* libmailutils/address/Makefile.am
* libmailutils/auth/Makefile.am
* libmailutils/base/Makefile.am
* libmailutils/cfg/Makefile.am
* libmailutils/cidr/Makefile.am
* libmailutils/cli/Makefile.am
* libmailutils/datetime/Makefile.am
* libmailutils/diag/Makefile.am
* libmailutils/filter/Makefile.am
* libmailutils/imapio/Makefile.am
* libmailutils/list/Makefile.am
* libmailutils/locus/Makefile.am
* libmailutils/mailbox/Makefile.am
* libmailutils/mailcap/Makefile.am
* libmailutils/mailer/Makefile.am
* libmailutils/mime/Makefile.am
* libmailutils/msgset/Makefile.am
* libmailutils/opt/Makefile.am
* libmailutils/property/Makefile.am
* libmailutils/server/Makefile.am
* libmailutils/sockaddr/Makefile.am
* libmailutils/stdstream/Makefile.am
* libmailutils/stream/Makefile.am
* libmailutils/string/Makefile.am
* libmailutils/tests/Makefile.am
* libmailutils/url/Makefile.am
* libmailutils/wicket/Makefile.am
* libmu_auth/Makefile.am
* libmu_cpp/Makefile.am
* libmu_dbm/Makefile.am
* libmu_scm/Makefile.am
* libmu_scm/mailutils/Makefile.am
* libmu_sieve/Makefile.am
* libmu_sieve/extensions/Makefile.am
* libproto/dotmail/Makefile.am
* libproto/dotmail/tests/Makefile.am
* libproto/imap/Makefile.am
* libproto/imap/tests/Makefile.am
* libproto/maildir/Makefile.am
* libproto/mailer/Makefile.am
* libproto/mbox/Makefile.am
* libproto/mh/Makefile.am
* libproto/nntp/Makefile.am
* libproto/pop/Makefile.am
* mail/Makefile.am
* mapi/Makefile.am
* mda/lib/Makefile.am
* mda/lmtpd/Makefile.am
* mda/mda/Makefile.am
* mda/mda/tests/Makefile.am
* mda/putmail/Makefile.am
* messages/Makefile.am
* mh/Makefile.am
* mh/tests/Makefile.am
* mimeview/Makefile.am
* movemail/Makefile.am
* mu/Makefile.am
* mu/libexec/Makefile.am
* pop3d/Makefile.am
* python/2/libmu_py/Makefile.am
* python/2/mailutils/Makefile.am
* python/3/libmu_py/Makefile.am
* python/3/mailutils/Makefile.am
* readmsg/Makefile.am
* sieve/Makefile.am
* sql/Makefile.am
* testsuite/Makefile.am

80 files changed, 11574 insertions, 402 deletions

diff --git a/am/gssapi.m4 b/am/gssapi.m4
index 8e4f5d709..ed25ddabf 100644
--- a/am/gssapi.m4
+++ b/am/gssapi.m4
@@ -14,11 +14,10 @@ AC_DEFUN([MU_CHECK_GSSAPI],
   GSSAPI_PREFIX=[$1]
   GSSAPI_IMPL="none"
   # First try krb5-config
-  if test "$GSSAPI_PREFIX" != "yes"; then
-    krb5_path="$GSSAPI_PREFIX/bin"
-  else
-    krb5_path="$PATH"
-  fi
+  case $GSSAPI_PREFIX in
+  yes|probe) krb5_path="$PATH";;
+  *)   krb5_path="$GSSAPI_PREFIX/bin"
+  esac
   AC_PATH_PROG(KRB5CFGPATH, krb5-config, none, $krb5_path)
   AC_CHECK_HEADER(gss.h, [wantgss=yes], [wantgss=no])
   if test $wantgss != no; then
@@ -47,12 +46,14 @@ int main() { return gss_check_version ("0.0.9") == (char*) 0; }],
     saved_CPPFLAGS="$CPPFLAGS"
     saved_LDFLAGS="$LDFLAGS"
     saved_LIBS="$LIBS"
-    if test "$GSSAPI_PREFIX" != "yes"; then
+    case $GSSAPI_PREFIX in
+    yes|probe) ;;
+    *)
       GSSAPI_CFLAGS="-I$GSSAPI_PREFIX/include"
       GSSAPI_LDFLAGS="-L$GSSAPI_PREFIX/lib"
       CPPFLAGS="$CPPFLAGS $GSSAPI_CFLAGS"
       LDFLAGS="$LDFLAGS $GSSAPI_LDFLAGS"
-    fi
+    esac
 
     ## Check for new MIT kerberos V support
     AC_CHECK_LIB(gssapi_krb5, gss_init_sec_context,
diff --git a/bootstrap.conf b/bootstrap.conf
index 361217c31..b6692e01f 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -113,3 +113,10 @@ if [ -z "$help" ]; then
       #make -C doc/texinfo -f maint.mk
 fi
 
+bootstrap_epilogue() {
+    # Install a ltmain.sh version that fixes the two libtool issues we've
+    # encountered.
+    # See http://gray.gnu.org.ua/public/ltbug for details.
+    set -e
+    (cd build-aux && rm ltmain.sh && ln -s ../mu-aux/ltmain.sh) 
+}
diff --git a/comsat/Makefile.am b/comsat/Makefile.am
index 5d124c521..b17c5318c 100644
--- a/comsat/Makefile.am
+++ b/comsat/Makefile.am
@@ -19,7 +19,7 @@ sbin_PROGRAMS = comsatd
 
 comsatd_SOURCES = action.c comsat.c comsat.h biff.rc.h
 AM_CPPFLAGS = \
- @MU_APP_COMMON_INCLUDES@\
+ $(MU_APP_COMMON_INCLUDES)\
  -DSYSCONFDIR=\"$(sysconfdir)\"
 
 BUILT_SOURCES=biff.rc.h
@@ -30,8 +30,8 @@ biff.rc.h: $(top_srcdir)/comsat/biff.rc
           $(top_srcdir)/comsat/biff.rc > biff.rc.h
 
 comsatd_LDADD = \
- ${MU_APP_LIBRARIES}\
- ${MU_LIB_MAILBOX}\
- ${MU_LIB_MAILUTILS}\
- @MU_COMMON_LIBRARIES@
+ $(MU_LIB_MAILBOX)\
+ $(MU_LIB_MAILUTILS)\
+ $(MU_APP_LIBRARIES)\
+ $(MU_COMMON_LIBRARIES)
 
diff --git a/configure.ac b/configure.ac
index 59b9fe777..575ff22f4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -76,11 +76,11 @@ gl_EARLY
 AC_PROG_CXX
 AC_PROG_INSTALL
 AC_PROG_LN_S
-AC_LIBTOOL_DLOPEN
-AC_PROG_LIBTOOL