+AC_MSG_CHECKING([whether your system knows about splice()])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <fcntl.h>
+]], [[
+ ssize_t sent, pipesize;
+ int fd, SplicePipe[2];
+ pipesize = splice(fd, NULL,
+ SplicePipe[1], NULL,
+ 1,
+ SPLICE_F_MORE | SPLICE_F_MOVE|SPLICE_F_NONBLOCK);
+]])],[
+ ok_splice=yes
+ AC_DEFINE(LINUX_SPLICE, [], [whether we have the linux splice api])
+ AC_MSG_RESULT([yes])
+ ],[
+ ok_splice=no
+ AC_MSG_RESULT([no])
+
+])
+
+AC_MSG_CHECKING([whether your system likes memcpy + HKEY])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/select.h>
+#include <fcntl.h>
+#include <sys/types.h>
+
+#include "lib/libcitadel.h"
+]], [[
+ char foo[22];
+ memcpy(foo, HKEY("foo"));
+
+]])],[
+
+ AC_MSG_RESULT([yes])
+ ],[
+ AC_DEFINE(UNDEF_MEMCPY, [], [whether we need to undefine memcpy])
+ AC_MSG_RESULT([no])
+
+])
+
+