diff --git a/configure.ac b/configure.ac
index 8ffc0b7ce..2c7cdeef6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -471,11 +471,6 @@ if test $gl_cv_sys_tiocgwinsz_needs_termios_h = no && \
                    [Define if your system defines TIOCGWINSZ in sys/pty.h.])
 fi
 
-# For src/kill.c.
-AC_CHECK_DECLS([strsignal, sys_siglist, _sys_siglist, __sys_siglist], , ,
-  [AC_INCLUDES_DEFAULT
-#include <signal.h>])
-
 # Build df only if there's a point to it.
 if test $gl_cv_list_mounted_fs = yes && test $gl_cv_fs_space = yes; then
   gl_ADD_PROG([optional_bin_progs], [df])
diff --git a/src/kill.c b/src/kill.c
index 47aaa1613..7eb5ef57a 100644
--- a/src/kill.c
+++ b/src/kill.c
@@ -33,24 +33,6 @@
 
 #define AUTHORS proper_name ("Paul Eggert")
 
-#if ! (HAVE_DECL_STRSIGNAL || defined strsignal)
-# if ! (HAVE_DECL_SYS_SIGLIST || defined sys_siglist)
-#  if HAVE_DECL__SYS_SIGLIST || defined _sys_siglist
-#   define sys_siglist _sys_siglist
-#  elif HAVE_DECL___SYS_SIGLIST || defined __sys_siglist
-#   define sys_siglist __sys_siglist
-#  endif
-# endif
-# if HAVE_DECL_SYS_SIGLIST || defined sys_siglist
-#  define strsignal(signum) (0 <= (signum) && (signum) <= SIGNUM_BOUND \
-                             ? sys_siglist[signum] \
-                             : 0)
-# endif
-# ifndef strsignal
-#  define strsignal(signum) 0
-# endif
-#endif
-
 static char const short_options[] =
   "0::1::2::3::4::5::6::7::8::9::"
   "A::B::C::D::E::F::G::H::I::J::K::M::"