diff --git a/autoconf/autoconf.spec b/autoconf/autoconf.spec
index 6aeed43f6d..c220533060 100644
--- a/autoconf/autoconf.spec
+++ b/autoconf/autoconf.spec
@@ -22,9 +22,15 @@
 ##  SUCH DAMAGE.
 ##
 
+#   version numbers
 %define       V_latest 2.54
 %define       V_old    2.13
 
+#   package options
+%ifndef       with_acx_pthread
+%define       with_acx_pthread no
+%endif
+
 #   package information
 Name:         autoconf
 Summary:      GNU Source Autoconfiguration
@@ -40,6 +46,7 @@ Release:      20021020
 #   list of sources
 Source1:      ftp://ftp.gnu.org/gnu/autoconf/autoconf-%{V_latest}.tar.gz
 Source0:      ftp://ftp.gnu.org/gnu/autoconf/autoconf-%{V_old}.tar.gz
+Source2:      http://www.gnu.org/software/ac-archive/Installed_Packages/acx_pthread.m4
 Patch0:       autoconf-%{V_old}.patch
 
 #   build information
@@ -57,11 +64,21 @@ AutoReqProv:  no
     is mostly needed by people producing packages that run on a wide
     variety of platforms--particularly UNIX-a-likes.
 
+    Options:
+    --define 'with_acx_pthread      %{with_acx_pthread}'
+
 %prep
     %setup0 -q -c -n autoconf-%{V_latest}
     %setup1 -q -T -D -a 1
     cd autoconf-%{V_old}
     %{l_patch} -p0 <%{SOURCE autoconf-%{V_old}.patch}
+    ( cd ../autoconf-%{V_latest}/lib/autoconf
+%if "%{with_acx_pthread}" == "yes"
+      cp -rp %{SOURCE acx_pthread.m4} .
+      cat autoconf.m4 | %{l_sed} -e '69a\
+m4_include([autoconf/acx_pthread.m4])' >autoconf.m4
+%endif
+    )
 
 %build
     ( cd autoconf-%{V_old}
@@ -95,6 +112,9 @@ AutoReqProv:  no
       %{l_make} %{l_mflags} install \
           prefix=$RPM_BUILD_ROOT%{l_prefix}
     )
+%if "%{with_acx_pthread}" == "yes"
+    cp -rp %{SOURCE acx_pthread.m4} $RPM_BUILD_ROOT%{l_prefix}/share/autoconf/autoconf
+%endif
     rm -f $RPM_BUILD_ROOT%{l_prefix}/info/dir
     %{l_rpmtool} files -v -ofiles -r$RPM_BUILD_ROOT %{l_files_std}