+ sysconf\
+ readv])
+
+# check for a working snprintf (or use xbt/snprintf.c, which comes from http://www.ijs.si/software/snprintf/)
+AC_FUNC_SNPRINTF
+# check for asprintf function familly (or request the replacements from xbt/snprintf.c)
+AC_CHECK_FUNC( asprintf, :, AC_DEFINE(NEED_ASPRINTF, 1, enable the asprintf replacement))
+AC_CHECK_FUNC( vasprintf, :, AC_DEFINE(NEED_VASPRINTF, 1, enable the vasprintf replacement))
+# we don't use those:
+# A C_CHECK_FUNC( asnprintf, :, A C_DEFINE(NEED_ASNPRINTF, 1, enable the asnprintf replacement))
+# A C_CHECK_FUNC(vasnprintf, :, A C_DEFINE(NEED_VASNPRINTF, 1, enable the vansprintf replacement))
+
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+AC_C_INLINE
+AC_TYPE_SIZE_T
+
+###################################
+## SimGrid and GRAS specific checks
+##
+
+SG_CONFIGURE_PART(Checking GRAS architecture signature...)
+# Check architecture signature begin
+GRAS_ARCH
+# Check architecture signature end
+GRAS_CHECK_STRUCT_COMPACTION
+
+
+dnl ##
+dnl ## CONTEXT IMPLEMENTATION
+dnl ##
+
+SG_CONFIGURE_PART([Checking for threads, contexts or assimilated...])
+
+dnl #
+dnl # 1. determine possibilities
+dnl #