Index: libcfa/configure.ac
===================================================================
--- libcfa/configure.ac	(revision 85f19ebf5f3925f6f8cf0da46faa83cd28c69395)
+++ libcfa/configure.ac	(revision c402739f790c375d9b5414d824619c6457f1948d)
@@ -166,4 +166,5 @@
 AH_TEMPLATE([CFA_HAVE_IORING_OP_PROVIDE_BUFFERS],[Defined if io_uring support is present when compiling libcfathread and supports the operation IORING_OP_PROVIDE_BUFFERS.])
 AH_TEMPLATE([CFA_HAVE_IORING_OP_REMOVE_BUFFER],[Defined if io_uring support is present when compiling libcfathread and supports the operation IORING_OP_REMOVE_BUFFER.])
+AH_TEMPLATE([CFA_HAVE_IORING_OP_TEE],[Defined if io_uring support is present when compiling libcfathread and supports the operation IORING_OP_TEE.])
 AH_TEMPLATE([CFA_HAVE_IOSQE_FIXED_FILE],[Defined if io_uring support is present when compiling libcfathread and supports the flag FIXED_FILE.])
 AH_TEMPLATE([CFA_HAVE_IOSQE_IO_DRAIN],[Defined if io_uring support is present when compiling libcfathread and supports the flag IO_DRAIN.])
@@ -173,9 +174,12 @@
 AH_TEMPLATE([CFA_HAVE_SPLICE_F_FD_IN_FIXED],[Defined if io_uring support is present when compiling libcfathread and supports the flag SPLICE_F_FD_IN_FIXED.])
 AH_TEMPLATE([CFA_HAVE_IORING_SETUP_ATTACH_WQ],[Defined if io_uring support is present when compiling libcfathread and supports the flag IORING_SETUP_ATTACH_WQ.])
-AH_TEMPLATE([HAVE_PREADV2],[Defined if preadv2 support is present when compiling libcfathread.])
-AH_TEMPLATE([HAVE_PWRITEV2],[Defined if pwritev2 support is present when compiling libcfathread.])
+AH_TEMPLATE([CFA_HAVE_PREADV2],[Defined if preadv2 support is present when compiling libcfathread.])
+AH_TEMPLATE([CFA_HAVE_PWRITEV2],[Defined if pwritev2 support is present when compiling libcfathread.])
+AH_TEMPLATE([CFA_HAVE_PWRITEV2],[Defined if pwritev2 support is present when compiling libcfathread.])
+AH_TEMPLATE([CFA_HAVE_STATX],[Defined if statx support is present when compiling libcfathread.])
+AH_TEMPLATE([CFA_HAVE_OPENAT2],[Defined if openat2 support is present when compiling libcfathread.])
 AH_TEMPLATE([__CFA_NO_STATISTICS__],[Defined if libcfathread was compiled without support for statistics.])
 
-define(ioring_ops, [IORING_OP_NOP,IORING_OP_READV,IORING_OP_WRITEV,IORING_OP_FSYNC,IORING_OP_READ_FIXED,IORING_OP_WRITE_FIXED,IORING_OP_POLL_ADD,IORING_OP_POLL_REMOVE,IORING_OP_SYNC_FILE_RANGE,IORING_OP_SENDMSG,IORING_OP_RECVMSG,IORING_OP_TIMEOUT,IORING_OP_TIMEOUT_REMOVE,IORING_OP_ACCEPT,IORING_OP_ASYNC_CANCEL,IORING_OP_LINK_TIMEOUT,IORING_OP_CONNECT,IORING_OP_FALLOCATE,IORING_OP_OPENAT,IORING_OP_CLOSE,IORING_OP_FILES_UPDATE,IORING_OP_STATX,IORING_OP_READ,IORING_OP_WRITE,IORING_OP_FADVISE,IORING_OP_MADVISE,IORING_OP_SEND,IORING_OP_RECV,IORING_OP_OPENAT2,IORING_OP_EPOLL_CTL,IORING_OP_SPLICE,IORING_OP_PROVIDE_BUFFERS,IORING_OP_REMOVE_BUFFER])
+define(ioring_ops, [IORING_OP_NOP,IORING_OP_READV,IORING_OP_WRITEV,IORING_OP_FSYNC,IORING_OP_READ_FIXED,IORING_OP_WRITE_FIXED,IORING_OP_POLL_ADD,IORING_OP_POLL_REMOVE,IORING_OP_SYNC_FILE_RANGE,IORING_OP_SENDMSG,IORING_OP_RECVMSG,IORING_OP_TIMEOUT,IORING_OP_TIMEOUT_REMOVE,IORING_OP_ACCEPT,IORING_OP_ASYNC_CANCEL,IORING_OP_LINK_TIMEOUT,IORING_OP_CONNECT,IORING_OP_FALLOCATE,IORING_OP_OPENAT,IORING_OP_CLOSE,IORING_OP_FILES_UPDATE,IORING_OP_STATX,IORING_OP_READ,IORING_OP_WRITE,IORING_OP_FADVISE,IORING_OP_MADVISE,IORING_OP_SEND,IORING_OP_RECV,IORING_OP_OPENAT2,IORING_OP_EPOLL_CTL,IORING_OP_SPLICE,IORING_OP_PROVIDE_BUFFERS,IORING_OP_REMOVE_BUFFER,IORING_OP_TEE])
 define(ioring_flags, [IOSQE_FIXED_FILE,IOSQE_IO_DRAIN,IOSQE_ASYNC,IOSQE_IO_LINK,IOSQE_IO_HARDLINK,SPLICE_F_FD_IN_FIXED,IORING_SETUP_ATTACH_WQ])
 
@@ -222,5 +226,6 @@
 	])
 ])
-AC_CHECK_FUNCS([preadv2 pwritev2])
+AC_CHECK_FUNC([preadv2], [AC_DEFINE([CFA_HAVE_PREADV2])])
+AC_CHECK_FUNC([pwritev2], [AC_DEFINE([CFA_HAVE_PWRITEV2])])
 
 AC_CONFIG_FILES([
@@ -229,4 +234,5 @@
 	prelude/Makefile
 	])
+AC_CONFIG_FILES([src/concurrency/io/call.cfa], [python3 ${srcdir}/src/concurrency/io/call.cfa.in > src/concurrency/io/call.cfa])
 
 AC_CONFIG_HEADERS(prelude/defines.hfa)