libmu_cpp wraps several other libraries that it doesn't explicitly link
against, so as shipped it doesn't link with -Wl,--as-needed. This makes it link
with the libraries it needs (at least on my machine), and fixes the build order
so libmu_sieve gets built before libmu_cpp needs it.

diff -x config.log -x config.status -ru tmp/mailutils-2.1/Makefile.am work/mailutils-2.1/Makefile.am
--- tmp/mailutils-2.1/Makefile.am	2009-08-14 08:47:50.000000000 +0100
+++ work/mailutils-2.1/Makefile.am	2009-09-12 00:35:31.000000000 +0100
@@ -100,9 +100,9 @@
  lib\
  libmu_argp\
  libmu_cfg\
+ libmu_sieve\
  $(LIBMU_CPP_DIR)\
  $(LIBMU_SCM_DIR)\
- libmu_sieve\
  $(PYTHON_DIR)\
  doc\
  config\
diff -x config.log -x config.status -ru tmp/mailutils-2.1/libmu_cpp/Makefile.am work/mailutils-2.1/libmu_cpp/Makefile.am
--- tmp/mailutils-2.1/libmu_cpp/Makefile.am	2009-08-12 22:04:39.000000000 +0100
+++ work/mailutils-2.1/libmu_cpp/Makefile.am	2009-09-12 00:34:51.000000000 +0100
@@ -45,6 +45,20 @@
  stream.cc\
  url.cc
 
-libmu_cpp_la_LIBADD = @MU_COMMON_LIBRARIES@
+libmu_cpp_la_LIBADD = \
+ ../lib/libmuaux.la\
+ ${MU_LIB_MBOX}\
+ ${MU_LIB_IMAP}\
+ ${MU_LIB_POP}\
+ ${MU_LIB_NNTP}\
+ ${MU_LIB_MH}\
+ ${MU_LIB_MAILDIR}\
+ ${MU_LIB_AUTH}\
+ ${MU_LIB_MAILER}\
+ ${MU_LIB_SIEVE}\
+ @address@hidden
+ ${MU_LIB_MAILUTILS}\
+ @address@hidden
+ @MU_COMMON_LIBRARIES@
 libmu_cpp_la_LDFLAGS = -rpath $(libdir)  -version-info @VI_CURRENT@:@VI_REVISION@:@VI_AGE@