The following problems have been reported by readers building the source code. I am just collecting these and making them available: I do not have access to all the systems to try and duplicate the problems and/or fix them. Please let me know of any additional problems.

• Digital Unix 4.0: The configure script does not find the sigwait function. The easiest solution is to uncomment the #undef of HAVE_SIGWAIT in config.h and change the #undef to #define.

• HP-UX 10.x/GCC: Run ./configure as instructed in the README file.

  Edit the file unpv22e/lib/unpipc.h and insert #ifdef HAVE_PTHREAD_H just before the Pthread_xxxx prototypes, (which start on line 427), and put a #endif just after the prototype for pr_thread_id. (New line 459.)

  Edit the file unpv22e/lib/my_shm.c and change both occurrences of MAP_ANON to MAP_ANONYMOUS.

  Optional: If you have superuser privileges, clean up the include header /usr/include/rpc/xdr.h: Remove the extra /* inside the commented-out #endif on line 26--this will stop a plethora of (harmless) compiler warnings about the embedded comment start token.

  cd to unpv22e/lib and do a make.

  Continue on as described in the README file.

• AIX 4.3.1: There are three compiler warnings when compiling the file /lib/wrapsunrpc.c. These are because the AIX headers do not use the const qualifier for the first and last arguments to clnt_create.

  Beware of the following comment in the system headers <mqueue.h> and <semaphore.h>:

  	/* THIS FILE is for conformance to IEEE POSIX 1003.1c.
  	 * It describes required symbols for the Realtime option
  	 * which is NOT SUPPORTED.
  	 */
  	

  AIX 4.3.1 does conform to Unix 98, but the Posix realtime options are (unfortunately) an option to Unix 98.

• Linux: The standard Linux releases do not support the Posix.1b APIs (Posix message queues, Posix semaphores, and Posix shared memory). I just just been made aware of a Posix.1b library for Linux.

• Linux, RedHat 5.1: The function prototype for semctl in <sys/sem.h> is wrong: the fourth argument is optional (depending on the command) and should be specified as ... (an ellipsis). This causes an error when compiling the library. The easiest fix is to add a dummy argument of 0 to the call to semctl that contains just three arguments in lib/wrapunix.c.

  This system also has a <semaphore.h> header, but it doesn't appear to fully support Posix semaphores (it appears to support only Posix memory-based semaphores). To prevent trying to use Posix semaphores, comment out the definition of HAVE_SEMAPHORE_H in the config.h header.

• Solaris 2.6: All my Solaris work was done with GCC, not the Sun C compiler. (Anyone at Sun is welcome to send me the Sun compiler.) The CFLAGS variable set by the configure script almost certainly needs to be changed for the Sun compiler.