Notes on compiling APL\11 for modern Linux
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Using Michael Cain version of APL\11 
apl11.tar.gz Nov 1992

Currently using FC1 (Fedora Core 1) with gcc 2.95.3 development system
Using FC1 yacc
executable apl can be transplanted to modern linux
executable is statically linked

code has been tested to compile on: 

SunOS 4.1 gcc 1.4
Linux gcc 2.2.2
Linux gcc 2.95.3

makefile produces executable apl

many other versions exist:

Unix v6         1975 (apl code missing)
3BSD            1979 
4.2BSD          1982
2.9BSD          1983
4.3BSD     june 1986
2.11BSD         1992 (backport of 4.3BSD to PDP-11)
openAPL 0.14    1999 (needs X11 and special font, more info in openapl-notes.txt)
Amiga4APL       1999 (Cain version ported to Amiga 68K)

observations
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APL\11 seems very similar to APL\360 except that ASCII is used
all code ported from APL\360 ran fine on APL\11

openAPL neededs elvis, rxvt4apl and readline 
openAPL compiled on FC1