diff --git a/benchmarks/Makefile.in b/benchmarks/Makefile.in
index 82c9875..60990e7 100644
--- a/benchmarks/Makefile.in
+++ b/benchmarks/Makefile.in
@@ -228,9 +228,9 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu benchmarks/Makefile'; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign benchmarks/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu benchmarks/Makefile
+	  $(AUTOMAKE) --foreign benchmarks/Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
diff --git a/config.h.in b/config.h.in
index e73a40b..8b81e47 100644
--- a/config.h.in
+++ b/config.h.in
@@ -42,6 +42,9 @@
 /* Define to 1 if you have the `gmp' library (-lgmp). */
 #undef HAVE_LIBGMP
 
+/* Define to 1 if you have the `pthread' library (-lpthread). */
+#undef HAVE_LIBPTHREAD
+
 /* Define to 1 if your system has a GNU libc compatible `malloc' function, and
    to 0 otherwise. */
 #undef HAVE_MALLOC
diff --git a/configure b/configure
index daea1a9..2ba400d 100755
--- a/configure
+++ b/configure
@@ -5982,6 +5982,46 @@ fi
 done
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lpthread" >&5
+$as_echo_n "checking for main in -lpthread... " >&6; }
+if test "${ac_cv_lib_pthread_main+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lpthread  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+int
+main ()
+{
+return main ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_pthread_main=yes
+else
+  ac_cv_lib_pthread_main=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_pthread_main" >&5
+$as_echo "$ac_cv_lib_pthread_main" >&6; }
+if test "x$ac_cv_lib_pthread_main" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBPTHREAD 1
+_ACEOF
+
+  LIBS="-lpthread $LIBS"
+
+fi
+
+
 for ac_header in gmp.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "gmp.h" "ac_cv_header_gmp_h" "$ac_includes_default"
diff --git a/configure.ac b/configure.ac
index e5113c8..b99b163 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,8 @@ AC_CHECK_HEADERS([assert.h dlfcn.h errno.h fcntl.h signal.h \
                   sys/time.h sys/types.h sys/wait.h time.h \
                   unistd.h])
 
+AC_CHECK_LIB(pthread, main)
+
 AC_CHECK_HEADERS([gmp.h],,[AC_MSG_ERROR([
 ERROR: Cannot find libgmp. 
 ERROR: You might want to supply CFLAGS=-I</path/to/include> (containing
diff --git a/doc/Makefile.in b/doc/Makefile.in
index c486b2b..43e137b 100644
--- a/doc/Makefile.in
+++ b/doc/Makefile.in
@@ -189,9 +189,9 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu doc/Makefile'; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign doc/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu doc/Makefile
+	  $(AUTOMAKE) --foreign doc/Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
diff --git a/lib/Makefile.in b/lib/Makefile.in
index c43eed4..26e9486 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -200,9 +200,9 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu lib/Makefile'; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign lib/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu lib/Makefile
+	  $(AUTOMAKE) --foreign lib/Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
diff --git a/scheme/Makefile.in b/scheme/Makefile.in
index 58dee21..852369e 100644
--- a/scheme/Makefile.in
+++ b/scheme/Makefile.in
@@ -289,9 +289,9 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu scheme/Makefile'; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign scheme/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu scheme/Makefile
+	  $(AUTOMAKE) --foreign scheme/Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
diff --git a/scheme/last-revision b/scheme/last-revision
index 881d986..ea6d98f 100644
--- a/scheme/last-revision
+++ b/scheme/last-revision
@@ -1 +1 @@
-1852
+1853
diff --git a/src/Makefile.in b/src/Makefile.in
index f72396e..dd03536 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -211,9 +211,9 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu src/Makefile'; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu src/Makefile
+	  $(AUTOMAKE) --foreign src/Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \