*** a/configure.in
--- b/configure.in
***************
*** 558,569 **** IFS=$ac_save_IFS
  # Enable thread-safe client libraries
  #
  AC_MSG_CHECKING([allow thread-safe client libraries])
- if test "$PORTNAME" != "win32"; then
- PGAC_ARG_BOOL(enable, thread-safety, no, [make client libraries thread-safe])
- else
- # Win32 should always use threads
  PGAC_ARG_BOOL(enable, thread-safety, yes, [make client libraries thread-safe])
- fi
  
  PGAC_ARG_BOOL(enable, thread-safety-force, no, [force thread-safety despite thread test failure])
  if test "$enable_thread_safety" = yes -o \
--- 558,564 ----