Note (probably harmless): No library found for '-lgtk'
Note (probably harmless): No library found for '-lgdk'
ngw/include/gtk-1.3 -IC:\mingw/lib/gtk+/include
GTKLIB=-LC:\mingw/lib -lgtk -lgdk
GLIBINC=-IC:\mingw/include/glib-2.0 -IC:\mingw/lib/glib-2.0/include
GLIBLIB=-LC:\mingw/lib/glib-2.0 -lglib -lgmodule
ECFLAGS=-mno-cygwin  -mms-bitfields
ELIBS=

Checking if your kit is complete...
Looks good
Writing Makefile for pgk_xs
cp pgk.pm blib\lib\pgk.pm
cp pgk_xs.pm blib\lib\pgk_xs.pm
	D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\Command line warning D4002 : ignoring unknown option '-mno-cygwin'
Command line warning D4002 : ignoring unknown option '-mms-bitfields'
NMAKE : fatal error U1077: 'cl' : return code '0x2'
Stop.
ld\5-6-1\lib -Id:\cpanrun\build\5-6-1\lib -MExtUtils::Command -e mv pgk_xs.xsc pgk_xs.c
	cl -c -mno-cygwin  -mms-bitfields -IC:\mingw/include/gtk-1.3 -IC:\mingw/lib/gtk+/include -IC:\mingw/include/glib-2.0 -IC:\mingw/lib/glib-2.0/include -nologo -O1 -MD -Zi -DNDEBUG -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX -O1 -MD -Zi -DNDEBUG    -DVERSION=\"0.05\"  -DXS_VERSION=\"0.05\"  -ID:\cpanrun\build\5-6-1\lib\CORE  pgk_xs.c
pgk_xs.c
pgk_xs.xs(1) : fatal error C1083: Cannot open include file: 'gtk/gtk.h': No such file or directory