Giles Lean's test code gives

(wrong) 0.785398163397448 with
NetBSD 1.3_ALPHA Sat Nov  8 17:31:51 GMT 1997
% ls -l /usr/lib/libm*
-r--r--r--  1 bin  bin  131830 Nov  7 16:37 /usr/lib/libm.a
-r--r--r--  1 bin  bin  106200 Nov  7 16:37 /usr/lib/libm.so.0.1
-r--r--r--  1 bin  bin  170662 Nov  7 16:37 /usr/lib/libm_p.a
-r--r--r--  1 bin  bin  176476 Nov  7 16:37 /usr/lib/libm_pic.a

(right) 0.694738276196703 with
NetBSD 1.2G Sun Oct  5 12:25:48 BST 1997
% ls -l /usr/lib/libm*
-r--r--r--  1 bin  bin  122966 Oct  3 18:52 /usr/lib/libm.a
-r--r--r--  1 bin  bin   98008 Oct  3 18:52 /usr/lib/libm.so.0.1
-r--r--r--  1 bin  bin  158952 Oct  3 18:52 /usr/lib/libm_p.a
-r--r--r--  1 bin  bin  167608 Oct  3 18:52 /usr/lib/libm_pic.a

Just in case the dates help...

Cheers,

 Patrick