I have encountered a strange phenomenon, and I would like to fix it, if it weren't for the fact that I have no idea why it appears.

So what happened? When using the zstreams.pp unit in a sample project I get an error message "Fatal: Can't find unit FPReadPNG". I searched all sources to find out which one is using the FPReadPNG unit that could be called in return by any unit coming from zstreams, but no success. I'm clueless here. Does anyone have a suggestion where to look, or an explanation why this is happening?

Please note that I've been mixing 2.1.1 sources (zipper and zstream) with a 2.0.2 and 2.0.4 compiler. I don't expect that this is the cause of this err message, but perhaps it is.

Below is a list of messages I took from the lazarus messages window.

Darius

Hint: Start of reading config file C:\lazarus\pp\bin\i386-win32\fpc.cfg
Hint: End of reading config file C:\lazarus\pp\bin\i386-win32\fpc.cfg
Free Pascal Compiler version 2.0.2 [2006/05/28] for i386
Copyright (c) 1993-2005 by Florian Klaempfl
Target OS: Win32 for i386
Compiling project1.lpr
Compiling zstream.pp
zstream.pp(125,3) Hint: Local variable "strm" does not seem to be initialized
zstream.pp(140,32) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(140,51) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(140,76) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(140,26) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(162,11) Hint: Type "PByte" redefinition
zstream.pp(164,3) Hint: Local variable "strm" does not seem to be initialized
zstream.pp(183,32) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(183,51) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(183,76) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(183,26) Hint: Conversion between ordinals and pointers is not
portable
zstream.pp(203,28) Hint: Type size mismatch, possible loss of data / range
check error
zstream.pp(71,23) Hint: Parameter "Buffer" not used
zstream.pp(71,31) Hint: Parameter "Count" not used
zstream.pp(280,34) Hint: Type size mismatch, possible loss of data / range
check error
zstream.pp(346,27) Warning: Mixing signed expressions and longwords gives
a 64bit result
zstream.pp(350,34) Hint: Type size mismatch, possible loss of data / range
check error
zstream.pp(355,20) Warning: Mixing signed expressions and longwords gives
a 64bit result
zstream.pp(87,26) Hint: Parameter "Buffer" not used
zstream.pp(87,34) Hint: Parameter "Count" not used
zstream.pp(382,22) Warning: Mixing signed expressions and longwords gives
a 64bit result
zstream.pp(388,9) Hint: Local variable "Buf" does not seem to be initialized
zstream.pp(1,1) Fatal: Can't find unit FPReadPNG

Well, the 2.1.1 stuff except rtl and compiler isn't supposed to be built by 2.0.x

However, to debug it further, have a look at the output generated by -va.