But why does the Makefile runs the compiler with these 2 flags: -DWIN32 -DWIN64

They're actually part of perl's ccflags: 
C:\perl -V:ccflags
ccflags=' -DWIN32 -DWIN64 -D__USE_MINGW_ANSI_STDIO -DPERL_TEXTMODE_SCR
+IPTS -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -fwrapv
+ -fno-strict-aliasing -mms-bitfields';

[download]

WIN32 is a symbol that's defined on all Windows systems (both 32-bit and 64-bit). I don't think there's any need to specify it.
Defining WIN64 specifies that you want to operate in 64-bit mode, and that the compiler is 64-bit..

Cheers,
Rob

In reply to Re^6: Installation of DBD::Sybase with Strawberry Perl by syphilis
in thread Installation of DBD::Sybase with Strawberry Perl by Anonymous Monk

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