diff --git a/configure.ac b/configure.ac
index 22258a9a9..1d8f92278 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,13 +33,12 @@ AM_INIT_AUTOMAKE
 AC_SUBST([LIBTOOL_DEPS])
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])],)
 AC_SUBST([docdir], [${datadir}/doc])
-AC_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])
 AC_ISC_POSIX
 AC_PROG_CC
 AC_PROG_CXX
 AC_C_INLINE
-AM_PROG_CC_STDC
 AC_HEADER_STDC
 AM_PROG_CC_C_O
 AC_CHECK_PROGS(MD5SUM,[md5sum md5])
diff --git a/coreapi/plugins/buddylookup/configure.ac b/coreapi/plugins/buddylookup/configure.ac
index 5e61343da..b3c3c711f 100644
--- a/coreapi/plugins/buddylookup/configure.ac
+++ b/coreapi/plugins/buddylookup/configure.ac
@@ -22,7 +22,7 @@ AC_ARG_ENABLE(strict,
 [wall_werror=yes]
 )
 
-dnl AC_CONFIG_HEADER([config.h])
+dnl AC_CONFIG_HEADERS([config.h])
 
 # Checks for programs.
 AC_PROG_CC