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+All right, you want to compile AS with a K&R compiler, and I hope you
+have really thought about it before attemptimg this.  Think a second
+and third time before you really go this way!  The procedure is
+tedious and error-prone. I really regard K&R C as being obsolete, and
+that is why I did not provide an 'automatic' way to compile AS with a
+K&R compiler.  You will probably face more problems than mentioned
+here, since K&R systems are mostly old systems that also lack library
+functions of newer systems.  The K&R support is mostly here because I
+have an old PCS/Cadmus system (the first german company in the 80s
+that built Unix systems, 68k-equipped and with a very bare System V.3
+port) whose compiler is even too stupid to compile GNU-C, so the
+description will orient along the things I had to do for the Cadmus. 
+This scheme however has also already worked for SunOS/Sparc with the
+old 'cc' compiler from Sun....
+
+1. remove the '#error' directives from 'sysdefs.h' - K&R
+   preprocessors do not know them.
+
+2. construct an appropriate 'Makefile.def' for your system.  Since
+   most older systems do not define OS-specific symbols, you might
+   have to define them yourself and correlate them to what you query
+   in 'sysdefs.h' for your system.  For a K&R compiler, '-Dsigned=
+   -Dconst=' is a good start to remove ANSI extensions.  For the
+   Cadmus, I also had to to add '-Dvoid=int' because the compiler's
+   void datatype was broken.
+
+3. There is a tool called 'a2k' to convert ANSI sources (headers &
+   c-files) to K&R style.  This mainly involves removing the
+   prototypes.  Don't think this is a general ANSI-->K&R converter,
+   since it heavily depends on my way of formatting C sources and
+   some additional differences are handled in the sources themselves
+   via __STDC__ queries!  To build a2k, a simple 'make a2k' should
+   suffice.
+
+4. Convert all header files to K&R, like in the following:
+ 
+   for i in *.h; do
+   cp $i $i.ansi
+   a2k $i.ansi $i
+   done
+
+5. Change the Makefile so that a2k is called as a preprocessor to the
+   compiler.  The simplest way is to modify the implicit rule:
+
+   .c.o:
+	a2k $*.c tmp.c
+	$(CC) $(ALLFLAGS) -c tmp.c
+	mv tmp.o $*.o
+	rm -f tmp.c
+
+6. Type 'make' and pray...
+
+One more thing: older Unix systems do not know symbolic links, so a manual
+'cp tests/t_secdrive/wd1003at.inc cp tests/t_secdrive/lowlevel.inc' might be
+necessary...