--- configure.in.~1.219.~	2003-05-31 09:42:52.000000000 +1000
+++ configure.in	2003-06-12 11:03:09.000000000 +1000
@@ -753,7 +753,10 @@
 
 AC_CHECK_HEADERS(floatingpoint.h ieeefp.h nan.h)
 
-AC_CHECK_FUNCS(finite isinf isnan copysign)
+# asinh, acosh, atanh, round and trunc (all in -lm) are only C99 standard
+# and older systems generally don't have them.
+#
+AC_CHECK_FUNCS(asinh acosh atanh copysign finite isinf isnan round trunc)
 
 # When testing for the presence of alloca, we need to add alloca.o
 # explicitly to LIBOBJS to make sure that it is translated to