diff --git a/configure.in b/configure.in
index c6b7a55..3e0248a 100644
--- a/configure.in
+++ b/configure.in
@@ -52,9 +52,7 @@
 if test -z "$MACHDEP"
 then
 	ac_sys_system=`uname -s`
-	if test "$ac_sys_system" = "AIX" -o \
-		"$ac_sys_system" = "Monterey64" -o \
-		"$ac_sys_system" = "UnixWare"; then
+	if test "$ac_sys_system" = "AIX" -o "$ac_sys_system" = "Monterey64"; then
 		ac_sys_release=`uname -v`
 	else
 		ac_sys_release=`uname -r`
@@ -127,15 +125,8 @@
 		;;
     Monterey*)
         RANLIB=:
-	    without_gcc=
-	    ;;
-	UnixWare*)
-	    RANLIB=:
-	    without_gcc=
-	    ;;
-	*)
-	    without_gcc=no
-	    ;;
+        without_gcc=;;
+	*)	without_gcc=no;;
 	esac])
 AC_MSG_RESULT($without_gcc)
 
@@ -273,9 +264,6 @@
       LDLIBRARY='libpython$(VERSION).dll.a'
       DLLLIBRARY='libpython$(VERSION).dll'
       ;;
-unixware*)
-      LDLIBRARY='libpython$(VERSION).so'
-      ;;
 esac
 AC_MSG_RESULT($LDLIBRARY)
 
@@ -530,6 +518,24 @@
 	fi
 fi
 
+# -Kpthread, if available, provides the right #defines
+# and linker options to make pthread_create available
+AC_MSG_CHECKING(whether $CC accepts -Kpthread)
+AC_CACHE_VAL(ac_cv_kpthread,
+[ac_save_cc="$CC"
+CC="$CC -Kpthread"
+AC_TRY_LINK([#include <pthread.h>],[pthread_create(0,0,0,0)],
+  ac_cv_kpthread=yes,
+  ac_cv_kpthread=no)
+CC="$ac_save_cc"])
+
+# GCC does not reject -Kpthread as an illegal option, it merely complains that
+# it is unrecognized
+if test "$GCC" = "yes"
+then ac_cv_kpthread="no, we have gcc"
+fi
+AC_MSG_RESULT($ac_cv_kpthread)
+
 dnl # check for ANSI or K&R ("traditional") preprocessor
 dnl AC_MSG_CHECKING(for C preprocessor type)
 dnl AC_TRY_COMPILE([
@@ -779,7 +785,7 @@
 	UnixWare*)
 		if test "$GCC" = "yes"
 		then LDSHARED="$(CC) -shared"
-		else LDSHARED="ld -G -dy -Bdynamic"
+		else LDSHARED="$(CC) -G"
 		fi;;
 	SCO_SV*) LDSHARED="cc -G -KPIC -Ki486 -belf -Wl,-Bexport";;
 	Monterey*) LDSHARED="cc -G -dy -Bdynamic -Bexport -L/usr/lib/ia64l64";;
@@ -809,7 +815,7 @@
 	UnixWare*)
 		if test "$GCC" = "yes"
 		then CCSHARED="-fPIC"
-		else CCSHARED="-KPIC -G -dy -Bdynamic"
+		else CCSHARED="-KPIC"
 		fi;;
 	SCO_SV*) CCSHARED="-KPIC -dy -Bdynamic";;
 	Monterey*) CCSHARED="-G";;
@@ -840,7 +846,7 @@
 	# loading of any modules which reference it in System.framework
 	next/4*|next/5*) LINKFORSHARED="-u __dummy -framework System" ;;
 	Darwin/*) LINKFORSHARED="-u __dummy -u _PyMac_Error -framework System -framework Foundation -framework Carbon" ;;
-	UnixWare*) LINKFORSHARED="-dy -Bdynamic -Wl,-Bexport";;
+	UnixWare*) LINKFORSHARED="-Wl,-Bexport";;
 	SCO_SV*) LINKFORSHARED="-Bdynamic -dy -Wl,-Bexport";;
 	ReliantUNIX*) LINKFORSHARED="-W1 -Blargedynsym";;
 	FreeBSD*|NetBSD*) 
@@ -964,87 +970,84 @@
 if test "$with_threads" = "no"
 then
     USE_THREAD_MODULE="#"
+elif test "$ac_cv_kpthread" = "yes"
+then
+    CC="$CC -Kpthread"
+    AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBOBJS="$LIBOBJS thread.o"
 else
-    if test "$ac_sys_system" = "UnixWare"
-     then
-	CC="${CC} -Kthread"
-	LIBOBJS="$LIBOBJS thread.o"
-	AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	USE_THREAD_MODULE=""
-    else
-	if test ! -z "$with_threads" -a -d "$with_threads"
-	then LDFLAGS="$LDFLAGS -L$with_threads"
-	fi
-	if test ! -z "$withval" -a -d "$withval"
-	then LDFLAGS="$LDFLAGS -L$withval"
-	fi
-	AC_DEFINE(_REENTRANT)
-	AC_CHECK_HEADER(mach/cthreads.h, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(C_THREADS)
-	LIBOBJS="$LIBOBJS thread.o"],[
-	AC_MSG_CHECKING(for --with-pth)
-	AC_ARG_WITH(pth,
-	[  --with-pth                      use GNU pth threading libraries], [
-	AC_MSG_RESULT($withval)
-	AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(HAVE_PTH)
-	LIBS="-lpth $LIBS"
-	LIBOBJS="$LIBOBJS thread.o"],[
-	AC_MSG_RESULT(no)
-	AC_CHECK_LIB(pthread, pthread_create, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	LIBS="-lpthread $LIBS"
-	LIBOBJS="$LIBOBJS thread.o"],[
-	AC_CHECK_FUNC(pthread_detach, [AC_DEFINE(WITH_THREAD)
-	case $ac_sys_system in
-	  Darwin*) ;;
-	  *) AC_DEFINE(_POSIX_THREADS);;
-	esac
-	LIBOBJS="$LIBOBJS thread.o"],[
-	AC_CHECK_HEADER(kernel/OS.h, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(BEOS_THREADS)
-	LIBOBJS="$LIBOBJS thread.o"],[
-	AC_CHECK_LIB(pthreads, pthread_create, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	LIBS="$LIBS -lpthreads"
-	LIBOBJS="$LIBOBJS thread.o"], [
-	AC_CHECK_LIB(c_r, pthread_create, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	LIBS="$LIBS -lc_r"
-	LIBOBJS="$LIBOBJS thread.o"], [
-	AC_CHECK_LIB(thread, __d6_pthread_create, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	LIBS="$LIBS -lthread"
-	LIBOBJS="$LIBOBJS thread.o"], [
-	AC_CHECK_LIB(pthread, __pthread_create_system, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	LIBS="$LIBS -lpthread"
-	LIBOBJS="$LIBOBJS thread.o"], [
-	AC_CHECK_LIB(cma, pthread_create, [AC_DEFINE(WITH_THREAD)
-	AC_DEFINE(_POSIX_THREADS)
-	LIBS="$LIBS -lcma"
-	LIBOBJS="$LIBOBJS thread.o"],[
-	USE_THREAD_MODULE="#"])
-	])])])])])])])])])
+    if test ! -z "$with_threads" -a -d "$with_threads"
+    then LDFLAGS="$LDFLAGS -L$with_threads"
+    fi
+    if test ! -z "$withval" -a -d "$withval"
+    then LDFLAGS="$LDFLAGS -L$withval"
+    fi
+    AC_DEFINE(_REENTRANT)
+    AC_CHECK_HEADER(mach/cthreads.h, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(C_THREADS)
+    LIBOBJS="$LIBOBJS thread.o"],[
+    AC_MSG_CHECKING(for --with-pth)
+    AC_ARG_WITH(pth,
+    [  --with-pth                      use GNU pth threading libraries], [
+    AC_MSG_RESULT($withval)
+    AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(HAVE_PTH)
+    LIBS="-lpth $LIBS"
+    LIBOBJS="$LIBOBJS thread.o"],[
+    AC_MSG_RESULT(no)
+    AC_CHECK_LIB(pthread, pthread_create, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBS="-lpthread $LIBS"
+    LIBOBJS="$LIBOBJS thread.o"],[
+    AC_CHECK_FUNC(pthread_detach, [AC_DEFINE(WITH_THREAD)
+    case $ac_sys_system in
+      Darwin*) ;;
+      *) AC_DEFINE(_POSIX_THREADS);;
+    esac
+    LIBOBJS="$LIBOBJS thread.o"],[
+    AC_CHECK_HEADER(kernel/OS.h, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(BEOS_THREADS)
+    LIBOBJS="$LIBOBJS thread.o"],[
+    AC_CHECK_LIB(pthreads, pthread_create, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBS="$LIBS -lpthreads"
+    LIBOBJS="$LIBOBJS thread.o"], [
+    AC_CHECK_LIB(c_r, pthread_create, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBS="$LIBS -lc_r"
+    LIBOBJS="$LIBOBJS thread.o"], [
+    AC_CHECK_LIB(thread, __d6_pthread_create, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBS="$LIBS -lthread"
+    LIBOBJS="$LIBOBJS thread.o"], [
+    AC_CHECK_LIB(pthread, __pthread_create_system, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBS="$LIBS -lpthread"
+    LIBOBJS="$LIBOBJS thread.o"], [
+    AC_CHECK_LIB(cma, pthread_create, [AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(_POSIX_THREADS)
+    LIBS="$LIBS -lcma"
+    LIBOBJS="$LIBOBJS thread.o"],[
+    USE_THREAD_MODULE="#"])
+    ])])])])])])])])])
 
-	AC_CHECK_LIB(mpc, usconfig, [AC_DEFINE(WITH_THREAD)
-	LIBS="$LIBS -lmpc"
-	LIBOBJS="$LIBOBJS thread.o"
-	USE_THREAD_MODULE=""])
-	AC_CHECK_LIB(thread, thr_create, [AC_DEFINE(WITH_THREAD)
-	LIBS="$LIBS -lthread"
-	LIBOBJS="$LIBOBJS thread.o"
-	USE_THREAD_MODULE=""])
+    AC_CHECK_LIB(mpc, usconfig, [AC_DEFINE(WITH_THREAD)
+    LIBS="$LIBS -lmpc"
+    LIBOBJS="$LIBOBJS thread.o"
+    USE_THREAD_MODULE=""])
+    AC_CHECK_LIB(thread, thr_create, [AC_DEFINE(WITH_THREAD)
+    LIBS="$LIBS -lthread"
+    LIBOBJS="$LIBOBJS thread.o"
+    USE_THREAD_MODULE=""])
 
-	if test "$USE_THREAD_MODULE" != "#"
-	then
-	    # If the above checks didn't disable threads, (at least) OSF1
-	    # needs this '-threads' argument during linking.
-	    case $ac_sys_system in
-	    OSF1) LDLAST=-threads;;
-	    esac
-	fi
+    if test "$USE_THREAD_MODULE" != "#"
+    then
+        # If the above checks didn't disable threads, (at least) OSF1
+        # needs this '-threads' argument during linking.
+        case $ac_sys_system in
+        OSF1) LDLAST=-threads;;
+        esac
     fi
 fi