If you don't have DJGPP installed on your harddisk, create a directory for GNU Pascal (c:\gpc), and unzip the archives. Make sure you preserve the directory structure (use pkunzip -d). Now, add the directory where gpc.exe lives (c:\gpc\bin) to your path and set the DJGPP environment variable to point to your djgpp.env file:
set DJGPP=c:\gpc\djgpp.env
Then, add this to your djgpp.env file:
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[gpcpp]
C_INCLUDE_PATH=%/>;C_INCLUDE_PATH%%DJDIR%/lang/pascal;%DJDIR%/include
[gpc]
COMPILER_PATH=%/>;COMPILER_PATH%%DJDIR%/bin
LIBRARY_PATH=%/>;LIBRARY_PATH%%DJDIR%/lib;%DJDIR%/contrib/grx20/lib
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The GPC online documentation is in GNU info format; you need the Info reader (txi390b.zip) to read it, or use the built-in Info reader of the RHIDE or PENG IDE. To add the GPC documentation to the info directory file, edit the c:\gpc\info\dir file, and locate this section:
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* GCC: (gcc.inf).
The GNU C, C++, and Objective-C Compiler
* GDB: (gdb.inf).
The GNU Debugger (gdb and gdb-dpmi).
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To add GPC, change it to look like this:
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* GCC: (gcc.inf).
The GNU C, C++, and Objective-C Compiler
* GPC: (gpc.inf).
The GNU Pascal Compiler
* GDB: (gdb.inf).
The GNU Debugger (gdb and gdb-dpmi).
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Specific information for low-memory conditions and more can be found in the DJGPP FAQ and documentation.