Index: libcfa/configure.ac
===================================================================
--- libcfa/configure.ac	(revision e8261bb2d5672221f593ba7abb77aa70dd80c822)
+++ libcfa/configure.ac	(revision 1c54958547ccd9f8b7440aef23d4c3f6c0907bab)
@@ -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.])