diff --git a/configure.in b/configure.in
index a20a6734..29041b08 100644
--- a/configure.in
+++ b/configure.in
@@ -3,7 +3,7 @@ AC_INIT(libunwind, 0.97, libunwind@linux.hpl.hp.com)
 AC_CONFIG_SRCDIR(src/mi/backtrace.c)
 AC_CONFIG_AUX_DIR(config)
 AC_CANONICAL_SYSTEM
-AM_INIT_AUTOMAKE
+AM_INIT_AUTOMAKE([1.6 subdir-objects])
 AM_MAINTAINER_MODE
 AM_CONFIG_HEADER(include/config.h)
 
@@ -14,6 +14,7 @@ AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AM_PROG_LIBTOOL
 AM_PROG_AS
+AM_PROG_CC_C_O
 
 dnl Checks for libraries.
 AC_CHECK_LIB(uca, __uc_get_grs)