This patch fixes a bug that would cause the build function to hang
on SGIs.  It should have no effect on other platforms.

To fix:

1) apply the patch, either by hand or with Larry Wall's 'patch' program.
2) xmkmf; make Makefiles; make clean; make ; make install

*** /tmp/RCSAa07059     Thu Jun 16 22:12:00 1994
--- imake.defs  Thu Jun 16 20:45:59 1994
***************
*** 186,191 ****
--- 186,192 ----
   */
  #ifdef SGIArchitecture
  PVM_ARCH=SGI5
+ HENCE_DEFINES=-DHAVE_WAITPID -DSYSVSIGNAL
  #endif
  /*
   * End of architecture-specific defines


.