Added AM_PROG_CC_C_O to configure.ac
diff --git a/configure.ac b/configure.ac
index ae0303c..6863859 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,7 @@
 AC_PROG_CXX
 AC_PROG_RANLIB
 AM_PROG_AR
+AM_PROG_CC_C_O
 AC_LANG([C++])
 
 AX_CXX_COMPILE_STDCXX_11(, optional)