--- /dev/null
+diff -Nur amavisd-0.1.orig/acinclude.m4 amavisd-0.1.chng/acinclude.m4
+--- amavisd-0.1.orig/acinclude.m4 Thu Jan 1 01:00:00 1970
++++ amavisd-0.1.chng/acinclude.m4 Sun Jan 19 23:31:33 2003
+@@ -0,0 +1,190 @@
++dnl Available from the GNU Autoconf Macro Archive at:
++dnl http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html
++dnl
++AC_DEFUN([ACX_PTHREAD], [
++AC_REQUIRE([AC_CANONICAL_HOST])
++AC_LANG_SAVE
++AC_LANG_C
++acx_pthread_ok=no
++
++# We used to check for pthread.h first, but this fails if pthread.h
++# requires special compiler flags (e.g. on True64 or Sequent).
++# It gets checked for in the link test anyway.
++
++# First of all, check if the user has set any of the PTHREAD_LIBS,
++# etcetera environment variables, and if threads linking works using
++# them:
++if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
++ save_CFLAGS="$CFLAGS"
++ CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++ save_LIBS="$LIBS"
++ LIBS="$PTHREAD_LIBS $LIBS"
++ AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
++ AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
++ AC_MSG_RESULT($acx_pthread_ok)
++ if test x"$acx_pthread_ok" = xno; then
++ PTHREAD_LIBS=""
++ PTHREAD_CFLAGS=""
++ fi
++ LIBS="$save_LIBS"
++ CFLAGS="$save_CFLAGS"
++fi
++
++# We must check for the threads library under a number of different
++# names; the ordering is very important because some systems
++# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
++# libraries is broken (non-POSIX).
++
++# Create a list of thread flags to try. Items starting with a "-" are
++# C compiler flags, and other items are library names, except for "none"
++# which indicates that we try without any flags at all.
++
++acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt"
++
++# The ordering *is* (sometimes) important. Some notes on the
++# individual items follow:
++
++# pthreads: AIX (must check this before -lpthread)
++# none: in case threads are in libc; should be tried before -Kthread and
++# other compiler flags to prevent continual compiler warnings
++# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
++# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
++# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
++# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
++# -pthreads: Solaris/gcc
++# -mthreads: Mingw32/gcc, Lynx/gcc
++# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
++# doesn't hurt to check since this sometimes defines pthreads too;
++# also defines -D_REENTRANT)
++# pthread: Linux, etcetera
++# --thread-safe: KAI C++
++
++case "${host_cpu}-${host_os}" in
++ *solaris*)
++
++ # On Solaris (at least, for some versions), libc contains stubbed
++ # (non-functional) versions of the pthreads routines, so link-based
++ # tests will erroneously succeed. (We need to link with -pthread or
++ # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
++ # a function called by this macro, so we could check for that, but
++ # who knows whether they'll stub that too in a future libc.) So,
++ # we'll just look for -pthreads and -lpthread first:
++
++ acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
++ ;;
++esac
++
++if test x"$acx_pthread_ok" = xno; then
++for flag in $acx_pthread_flags; do
++
++ case $flag in
++ none)
++ AC_MSG_CHECKING([whether pthreads work without any flags])
++ ;;
++
++ -*)
++ AC_MSG_CHECKING([whether pthreads work with $flag])
++ PTHREAD_CFLAGS="$flag"
++ ;;
++
++ *)
++ AC_MSG_CHECKING([for the pthreads library -l$flag])
++ PTHREAD_LIBS="-l$flag"
++ ;;
++ esac
++
++ save_LIBS="$LIBS"
++ save_CFLAGS="$CFLAGS"
++ LIBS="$PTHREAD_LIBS $LIBS"
++ CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++
++ # Check for various functions. We must include pthread.h,
++ # since some functions may be macros. (On the Sequent, we
++ # need a special flag -Kthread to make this header compile.)
++ # We check for pthread_join because it is in -lpthread on IRIX
++ # while pthread_create is in libc. We check for pthread_attr_init
++ # due to DEC craziness with -lpthreads. We check for
++ # pthread_cleanup_push because it is one of the few pthread
++ # functions on Solaris that doesn't have a non-functional libc stub.
++ # We try pthread_create on general principles.
++ AC_TRY_LINK([#include <pthread.h>],
++ [pthread_t th; pthread_join(th, 0);
++ pthread_attr_init(0); pthread_cleanup_push(0, 0);
++ pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
++ [acx_pthread_ok=yes])
++
++ LIBS="$save_LIBS"
++ CFLAGS="$save_CFLAGS"
++
++ AC_MSG_RESULT($acx_pthread_ok)
++ if test "x$acx_pthread_ok" = xyes; then
++ break;
++ fi
++
++ PTHREAD_LIBS=""
++ PTHREAD_CFLAGS=""
++done
++fi
++
++# Various other checks:
++if test "x$acx_pthread_ok" = xyes; then
++ save_LIBS="$LIBS"
++ LIBS="$PTHREAD_LIBS $LIBS"
++ save_CFLAGS="$CFLAGS"
++ CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++
++ # Detect AIX lossage: threads are created detached by default
++ # and the JOINABLE attribute has a nonstandard name (UNDETACHED).
++ AC_MSG_CHECKING([for joinable pthread attribute])
++ AC_TRY_LINK([#include <pthread.h>],
++ [int attr=PTHREAD_CREATE_JOINABLE;],
++ ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
++ if test x"$ok" = xunknown; then
++ AC_TRY_LINK([#include <pthread.h>],
++ [int attr=PTHREAD_CREATE_UNDETACHED;],
++ ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
++ fi
++ if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
++ AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
++ [Define to the necessary symbol if this constant
++ uses a non-standard name on your system.])
++ fi
++ AC_MSG_RESULT(${ok})
++ if test x"$ok" = xunknown; then
++ AC_MSG_WARN([we do not know how to create joinable pthreads])
++ fi
++
++ AC_MSG_CHECKING([if more special flags are required for pthreads])
++ flag=no
++ case "${host_cpu}-${host_os}" in
++ *-aix* | *-freebsd*) flag="-D_THREAD_SAFE";;
++ *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
++ esac
++ AC_MSG_RESULT(${flag})
++ if test "x$flag" != xno; then
++ PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
++ fi
++
++ LIBS="$save_LIBS"
++ CFLAGS="$save_CFLAGS"
++
++ # More AIX lossage: must compile with cc_r
++ AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
++else
++ PTHREAD_CC="$CC"
++fi
++
++AC_SUBST(PTHREAD_LIBS)
++AC_SUBST(PTHREAD_CFLAGS)
++AC_SUBST(PTHREAD_CC)
++
++# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
++if test x"$acx_pthread_ok" = xyes; then
++ ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
++ :
++else
++ acx_pthread_ok=no
++ $2
++fi
++AC_LANG_RESTORE
++])dnl ACX_PTHREAD
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