[
AM_CONDITIONAL(USE_SHAREDMEMORY_API, true)
AC_DEFINE([USE_SHAREDMEMORY_API],[],[Use sharedmemory API])
+ AC_CHECK_FUNC([shm_open], [], [AC_CHECK_LIB([rt], [shm_open], [], [AC_MSG_ERROR([could not find shm_open() in librt])])])
], [
AM_CONDITIONAL(USE_SHAREDMEMORY_API, false)
])