   * You currently need GNU make to build the Libtool package itself.

   * On AIX there are two different styles of shared linking, one in
     which symbols are bound at link-time and one in which symbols are
     bound at runtime only, similar to ELF.  In case of doubt use
     `LDFLAGS=-Wl,-brtl' for the latter style.

   * On AIX, native tools are to be preferred over binutils; especially
     for C++ code, if using the AIX Toolbox GCC 4.0 and binutils,
     configure with `AR=/usr/bin/ar LD=/usr/bin/ld NM='/usr/bin/nm -B''.

   * On AIX, the `/bin/sh' is very slow due to its inefficient handling
     of here-documents.  A modern shell is preferable:
          CONFIG_SHELL=/bin/bash; export $CONFIG_SHELL
          $CONFIG_SHELL ./configure [...]

   * For C++ code with templates, it may be necessary to specify the
     way the compiler will generate the instantiations.  For Portland
     pgCC version5, use `CXX='pgCC --one_instantiation_per_object'' and
     avoid parallel `make'.

   * On Darwin, for C++ code with templates you need two level shared
     libraries.  Libtool builds these by default if
     `MACOSX_DEPLOYMENT_TARGET' is set to 10.3 or later at `configure'
     time.  See `rdar://problem/4135857' for more information on this
     issue.

   * The default shell on UNICOS 9, a ksh 88e variant, is too buggy to
     correctly execute the libtool script.  Users are advised to
     install a modern shell such as GNU bash.

   * Some HP-UX `sed' programs are horribly broken, and cannot handle
     libtool's requirements, so users may report unusual problems.
     There is no workaround except to install a working `sed' (such as
     GNU sed) on these systems.

   * The vendor-distributed NCR MP-RAS `cc' programs emits copyright on
     standard error that confuse tests on size of `conftest.err'.  The
     workaround is to specify `CC' when run configure with `CC='cc
     -Hnocopyr''.

   * Any earlier DG/UX system with ELF executables, such as R3.10 or
     R4.10, is also likely to work, but hasn't been explicitly tested.

   * On Reliant Unix libtool has only been tested with the Siemens
     C-compiler and an old version of `gcc' provided by Marco Walther.

   * `libtool.m4', `ltdl.m4' and the `configure.ac' files are marked to
     use autoconf-mode, which is distributed with GNU Emacs 21,
     Autoconf itself, and all recent releases of XEmacs.

   * When building on some linux systems for multilib targets `libtool'
     sometimes guesses the wrong paths that the linker and dynamic
     linker search by default. If this occurs, you may override
     libtool's guesses at `configure' time by setting the `autoconf'
     cache variables `lt_cv_sys_lib_search_path_spec' and
     `lt_cv_sys_lib_dlsearch_path_spec' respectively to the correct
     search paths.