add AM_PROG_AR and AM_PROG_AR to satisfy new automake

diff --git a/configure.ac b/configure.ac
index c78e0e3..271eaa3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,9 @@ PLATFORM_INIT
 
 # Checks for programs.
 # AC_PROG_CXX
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AC_PROG_CC
+AM_PROG_CC_C_O
 AC_PROG_GCC_TRADITIONAL
 AC_PROG_LIBTOOL