add directory Minix

Minix/1.7.5/MANUALS/CAT0/IFDEF

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+Command:   ifdef - remove #ifdefs from a file
+Syntax:    ifdef [-t] [-dsymbol] [-Dsymbol] [-Usymbol] [-Isymbol] [file]
+Flags:     -D  Define symbol permanently
+           -I  Ignore symbol
+           -U  Undefine symbol permanently
+           -d  Define symbol. It may be #undef'ed later
+           -t  Produce a table of the symbols on stdout
+Examples:  ifdef -DUNIX file.c >newfile.c # Define UNIX
+           ifdef -D_MINIX -UDOS <x.c >y.c # Define
+
+     Ifdef  allows  conditional  code  [  #ifdef  ...  #endif  ]  to  be
+selectively removed from C files, but at the same time leaving all other
+C preprocessor commands intact such as #define, #include etc.  Input  to
+ifdef is either the file named as the last argument, or stdin if no file
+is named.  Output goes to stdout.
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+     Symbols may be defined with the -d  or  -D  flags  just  like  cpp,
+except  that  the  latter  option ignores subsequent #undefs.  It is not
+permitted to give values to symbols.  Similarly, -U undefines  a  symbol
+and  ignores subsequent #definess.  Symbols defined with -I are ignored;
+any #ifdef using an ignored symbol will be left intact.
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+                                                                        
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