I have found a problem with the configure script for rts (gpc 20010623). It fails to correctly determine the existence of sys_siglist which does not exist on my UnixWare system. It compiles a test program containing a reference to sys_siglist. This compilation succeeds as the compiler (gcc -g -O2) optimises out the unused variable. Taking the optimisation flag off the compiler makes the test work. This will probable effect other tests as well. Theo Carr-Brion