undefined reference to `__imp_SetupDiGetClassDevsA'


I think the problem is the line: 
libs => '-LC:\\MinGW\\lib -lSetupAPI',

[download]
I think it might be finding the wrong libsetupapi.a.
Try replacing that line with: 
libs => '-lsetupapi',

[download]
The correct 'libsetupapi.a' is in a location that should be found by default - so there should be no need to specify a location for it.
At least, for me, when I made that change to your script, it built just fine. Prior to that I was getting the same error as you.

Cheers,
Rob

In reply to Re: Win32/MingW SetupAPI usage woes with Inline::C by syphilis
in thread Win32/MingW SetupAPI usage woes with Inline::C by tlhackque

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