Fix warning about AM_PROG_CC_C_O.

diff --git a/configure.ac.in b/configure.ac.in
index 6253181..3cdd84f 100644 (file)
--- a/configure.ac.in
+++ b/configure.ac.in
@@ -32,6 +32,7 @@ AC_PROG_LD
 AC_PROG_INSTALL
 AC_PROG_LIBTOOL
 AM_PROG_LIBTOOL
+AM_PROG_CC_C_O
 
 AC_CHECK_PROG(HAVE_PKGCONFIG, pkg-config, yes, no)
 if test x"$HAVE_PKGCONFIG" = x"no"; then