The error it gives is redefinition of 'struct _GUID'. It is present in \include\common.c of AudioScan project as well as in compiler at ...

I see it in include/common.h: 
#ifndef __WIN32__
// We use the built-in GUID type on Windows
typedef struct _GUID {
  uint32_t Data1;
  uint16_t Data2;
  uint16_t Data3;
  uint8_t  Data4[8];
} _PACKED GUID;
#endif

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However, the C pre-processor will remove that code because __WIN32__ is defined (and hence violates the "#ifndef __WIN32__" condition).
In other words, it should not be necessary to comment out that section of code in common.h, and commenting out that code should make no difference.
Did you perhaps incorrectly replace "#ifndef _MSC_VER" with "#ifdef __WIN32__" ?

Scan.o:Scan.c:(.text+0x8d00): undefined reference to `uncompress'

This happens because you need to link to libz. It seems the link has been removed - probably by the 'perl Makefile.PL' step because libz.a could not be found.
To install libz, download the libz source, unzip it, then cd to the top level folder and run: 
mingw32-make -f win32/Makefile.gcc

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(The Audio::Scan source does not contain a win32 folder - but the libz source does.)
Then copy the generated libz.a to one of your $Config{libpth} directories. Enter perl -V:libpth to see where those directories are.
Your using a mingw compiler (not a micrsoft one), so you don't build libz with 'nmake', and you don't use Makefile.msc.

Cheers,
Rob

In reply to Re^5: unable to install Audio::Scan module from cpan by syphilis
in thread unable to install Audio::Scan module from cpan by vamank

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