--- rpl/README	2010/01/26 15:22:44	1.1.1.1
+++ rpl/README	2010/04/17 18:57:33	1.4
@@ -17,27 +17,52 @@ from the first RPL written by Hewlett-Pa
 this language is a half-compiled high level language which can perform
 symbolic and scientific computations.
 
+
+  * RPL/2 requires :
+	- nawk or gawk;
+	- libtool 1.5 or newer. To build RPL/2 on Mac OSX, you should have to
+	add libtool m4 path in tools/file-*/configure.ac and
+	tools/file-*/Makefile.am;
+	- gcc-4.2 or newer;
+	- g++-4.2 or newer;
+	- gfortran-4.2 or newer.
+
+	RPL/2 build process invoques automake and autoconf.
+
+  * OpenSSL issue :
+
+	OpenSSL does not use any configure script. If build process aborts on
+error related to OpenSSL, you shall try to build OpenSSL before running
+'make'. On some system, OpenSSL configure script is unable to set compiler
+flags.
+
   * RPL/2 is known to run on :
 
-	- Linux (kernel 2.6.12 and above) on i386, amd64, ppc32, sparc32,
+	- Linux (kernel 2.6.26 and above) on i386, amd64, ppc32, sparc32,
 		sparc64, alpha. Test distribution is Debian. Warning, you have to
 		use NPTL, not LinuxThreads due to a bug in sem_post() that is not
 		async safe.
 	- Solaris 9 and above on i386, amd64, sparc32 (only Solaris 9) and sparc64.
 		It can be built out of the box on Solaris in a 32bits userland. For a
-		64bits executable, you have to modify some generated makefiles. See
-		64bits on Solaris.
-	- FreeBSD 7.0 on i386.
-	- NetBSD 4.0 and above on sparc32 with a restriction. NetBSD's sigpending
+		64bits executable, you have to modify some generated makefiles or
+		specify some options. See 64bits on Solaris.
+	- FreeBSD 7.x on i386. I have installed a FreeBSD 7.0, upgraded to 7.2
+		and RPL/2 ran without any trouble. RPL/2 does not run on FreeBSD 8.0
+		because sig_into_t struct is not filled. Someone has reported that
+		FreeBSD 7.2 did not filled this struct too...
+	- NetBSD 4.0 and above with a restriction. NetBSD's sigpending
 		is broken and it is impossible to use DETACH intrinsic. Bug report
 		has been done and this bug should be fixed in next NetBSD release.
+		Sigpending has been fixed in NetBSD 5.0 and RPL/2 runs fine.
 
   * RPL/2 should run on :
 
 	- HP-UX (10.20 and above), but not tested for a long time.
-	- Linux (2.6.12 and above) on ppc64 and other hardware (arm, hppa...) or
+	- Linux (2.6.26 and above) on ppc64 and other hardware (arm, hppa...) or
 		with other distributions than Debian.
-	- FreeBSD 7.0 and above on other architecture than i386.
+	- FreeBSD 7.0 and above on other architecture than i386. Please not
+		that I cannot reproduce sig_info_t bug and I do not have more
+		information.
 	- NetBSD 4.0 and above on other architecture than sparc32 with restriction
 		due to sigpending bug.
 	- Mac OS X.
@@ -48,9 +73,12 @@ symbolic and scientific computations.
 
 	- OpenBSD due to a major bug in sigaltstack syscall when a program is
 		linked with -lthread. As this bug comes from OpenBSD libraries,
-		OpenBSD port has to wait for a fixed sigaltstack.
-	- OpenVMS (work in progress) on both VAX and Alpha due to some bugs in GNV.
-	- Hurd (vaporware...).
+		OpenBSD port has to wait for a fixed sigaltstack. RPL/2 uses pselect()
+		that is unavailable too.
+	- OpenVMS (work in progress) on Alpha and Integrity due to some bugs in GNV.
+		RPL/2 never works on OpenVMS VAX because GNV is too old on this
+		architecture.
+	- Hurd.
 
   * RPL/2 shall never be supported on :
 
@@ -68,7 +96,7 @@ symbolic and scientific computations.
 	several systems, some Posix libraries have strange 'features'...
 
 	On all systems, you must install GNU make and you should install
-	gcc/g++/gfortran (minimal release : 4.0.0). It is possible to build
+	gcc/g++/gfortran (minimal release : 4.2.0). It is possible to build
 	RPL/2 with some other compilers (for example cc and f95 from SunStudio,
 	or cc and f95 from Digital^WCompaq^WHP) but I do not test all potential
 	combinaisons.