Check for strsignal.
diff --git a/configure.in b/configure.in
index 7e91f3d..cd26e3a 100644
--- a/configure.in
+++ b/configure.in
@@ -41,7 +41,7 @@
 
 AC_CHECK_FUNCS(getdtablesize psignal mktemp \
 	       dup2 getcwd sigsetmask getgroups setlinebuf \
-	       seteuid setegid setreuid setregid strerror)
+	       seteuid setegid setreuid setregid strerror strsignal)
 AC_CHECK_SYMBOL(sys_siglist)
 AC_CHECK_SYMBOL(_sys_siglist)
 AC_FUNC_ALLOCA