Thanks alot for your answer. I installed it via "ppm". I'll install it via cpan to avoid the warning.

Now BrowserUk developed a Win32-JobAdd package which contains the same C code in a xs file. And you're right I had to set the value 0x2000 for the constant. And now I get exactly the undefined references which you describe.

Here the messages:

E:\perl\Win32-JobAdd-0.01>dmake
cp lib/Win32/JobAdd.pm blib\lib\Win32\JobAdd.pm
C:\Perl\bin\perl.exe C:\Perl\lib\ExtUtils\xsubpp  -typemap C:\Perl\lib
+\ExtUtils\
typemap  JobAdd.xs > JobAdd.xsc && C:\Perl\bin\perl.exe -MExtUtils::Co
+mmand -e "
mv" -- JobAdd.xsc JobAdd.c
Please specify prototyping behavior for JobAdd.xs (see perlxs manual)
C:/Perl/site/bin/gcc.exe -c  -I.        -DNDEBUG -DWIN32 -D_CONSOLE -D
+NO_STRICT
-DHAVE_DES_FCRYPT -DUSE_SITECUSTOMIZE -DPRIVLIB_LAST_IN_INC -DPERL_IMP
+LICIT_CONT
EXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX -DHASATTRIB
+UTE -fno-s
trict-aliasing -mms-bitfields -O2         -DVERSION=\"0.01\"    -DXS_V
+ERSION=\"0
.01\"  "-IC:\Perl\lib\CORE"   JobAdd.c
Running Mkbootstrap for Win32::JobAdd ()
C:\Perl\bin\perl.exe -MExtUtils::Command -e "chmod" -- 644 JobAdd.bs
C:\Perl\bin\perl.exe -MExtUtils::Mksymlists \
     -e "Mksymlists('NAME'=>\"Win32::JobAdd\", 'DLBASE' => 'JobAdd', '
+DL_FUNCS'
=> {  }, 'FUNCLIST' => [], 'IMPORTS' => {  }, 'DL_VARS' => []);"
Set up gcc environment - 3.4.5 (mingw-vista special r3)
dlltool --def JobAdd.def --output-exp dll.exp
C:\Perl\site\bin\g++.exe -o blib\arch\auto\Win32\JobAdd\JobAdd.dll -Wl
+,--base-fi
le -Wl,dll.base -mdll -L"C:\Perl\lib\CORE" JobAdd.o -Wl,--image-base,0
+x2e0b0000
 C:\Perl\lib\CORE\perl510.lib -lkernel32 -luser32 -lgdi32 -lwinspool -
+lcomdlg32
-ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lm
+pr -lwinmm
 -lversion -lodbc32 -lodbccp32 -lcomctl32 -lmsvcrt dll.exp
JobAdd.o:JobAdd.c:(.text+0x3f): undefined reference to `CreateJobObjec
+tA'
JobAdd.o:JobAdd.c:(.text+0x5f): undefined reference to `SetInformation
+JobObject'

JobAdd.o:JobAdd.c:(.text+0xa1): undefined reference to `AssignProcessT
+oJobObject
'
collect2: ld returned 1 exit status
dmake.exe:  Error code 129, while making 'blib\arch\auto\Win32\JobAdd\
+JobAdd.dll
'
[download]

Cheers,

Dirk