Add AM_PROG_CC_C_O for automake-1.10.

--HG--
branch : HEAD

configure.ac

diff --git a/configure.ac b/configure.ac
index fef608b..0a089b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,7 @@
 dnl AC_CANONICAL_HOST
 
 AC_PROG_CC
+AM_PROG_CC_C_O
 
 AC_ARG_WITH(zlib,
     [  --with-zlib=PREFIX  specify prefix for ZLIB library],,