HLASRC.ZIP should be unzipped preserving the directory
structure in the zip file (using the pkunzip -d option, or
with "Use folder names" checked in WinZip).
For example
    c:\hla\src\> pkunzip -d hlasrc.zip

To compile without any modifications, you need to have
DJGPP and Allegro installed in the standard 'out-of-the-box'
way, and LibPNG and ZLib will have to be installed and
made under the HLA source directory. If so, then you should just
have to type 'make' in the source directory.
    c:\hla\src\> make

Libpng and zlib are *not* included in the HLA source.
LibPNG can be found via
     http://www.libpng.org/pub/png/libpng.html
and ZLib can be downloaded via
     http://www.info-zip.org/pub/infozip/zlib/

If you already have LibPNG and Zlib (the POV-Ray source code
distribution contains them), they are almost surely not in the
'right' place for the HLA makefile. In this case, you can just
change the makefile lines:

     LIBDIRS = -Llpng106 -Lzlib -Lgdsource
     INCLUDEDIRS=-Ilpng106 -Izlib -Igdsource

to point to the appropriate place (for example):

     LIBDIRS = -Lc:/povray/source/lpng101 -Lc:/povray/source/zlib -Lgdsource
     INCLUDEDIRS=-Ic:/povray/source/lpng101 -Ic:/povray/source/zlib -Igdsource

(On the other hand, if you already have libgd, you should probably use
the libgd included with the HLA source, since newer versions do 
not support GIF files anymore.)
