Index: libcfa/configure.ac
===================================================================
--- libcfa/configure.ac	(revision 3f4bf57ea6373b8be8c9681fc1a88805b580fd23)
+++ libcfa/configure.ac	(revision 9e67e92cdc5aea59712a90875f89ff0562eec52c)
@@ -131,4 +131,10 @@
 #io_uring 5.5 uses enum values
 #io_uring 5.6 and later uses probes
+
+AH_TEMPLATE([CFA_HAVE_LINUX_RSEQ_H],[Defined if rseq support is present when compiling libcfathread.])
+AC_CHECK_HEADERS([linux/rseq.h], [AC_DEFINE(CFA_HAVE_LINUX_RSEQ_H)])
+
+AH_TEMPLATE([CFA_HAVE_LINUX_LIBRSEQ],[Defined if librseq support is present when compiling libcfathread.])
+AC_CHECK_LIB([rseq], [rseq_available], [AC_DEFINE(CFA_HAVE_LINUX_RSEQ_H)], [])
 
 AH_TEMPLATE([CFA_HAVE_LINUX_IO_URING_H],[Defined if io_uring support is present when compiling libcfathread.])