make all
+There is an alternate version for those with a compiler that support
+-traditional-cpp. See Alternate code below.
./wall
+This version is the original but which can be used if you have a compiler that
+supports the -traditional-cpp option.
make alt
+Use wall.alt as you would wall above.
The original version did not have a ‘;’ character in the first line. This caused a number of System V C pre-preprocessors to gripe about a @@ -444,6 +453,7 @@ compiler documents the program.
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