The output of perl -V:archname is archname='MSWin32-x86-multi-thread'; so $NTConfiguration is set to true. I deleted $opt{LD} right before WriteMakefile. When I re-ran perl Makefile.PL and nmake I got the following linker errors:

link -out:blib\arch\auto\DBD\Informix\Informix.dll -dll -nologo -nodef
+aultlib -debug -opt:ref,icf  -libpath:"C:\Perl\lib\CORE"  -machine:x8
+6 Informix.obj dbdimp.obj dbdattr.obj sqltoken.obj sqltype.obj ixblob
+.obj odbctype.obj kludge.obj link.obj esqlcver.obj esqlc_v6.obj /LIBP
+ATH:C:\PROGRA~2\IBM\Informix\11.70/lib /LIBPATH:C:\PROGRA~2\IBM\Infor
+mix\11.70/lib/esql       "C:/PROGRA~2/IBM/Informix/11.70\lib\isqlt09a
+.lib" "C:/PROGRA~2/IBM/Informix/11.70\lib\igl4n304.lib" "C:/PROGRA~2/
+IBM/Informix/11.70\lib\iglxn304.lib" "C:/PROGRA~2/IBM/Informix/11.70\
+lib\igo4n304.lib" netapi32.lib wsock32.lib user32.lib winmm.lib advap
+i32.lib  C:\Perl\lib\CORE\perl58.lib oldnames.lib kernel32.lib user32
+.lib gdi32.lib winspool.lib  comdlg32.lib advapi32.lib shell32.lib ol
+e32.lib oleaut32.lib  netapi32.lib uuid.lib ws2_32.lib mpr.lib winmm.
+lib  version.lib odbc32.lib odbccp32.lib msvcrt.lib -def:Informix.def
Informix.def : error LNK2001: unresolved external symbol ifx_checkAPI
Informix.def : error LNK2001: unresolved external symbol ifx_checkAPI
blib\arch\auto\DBD\Informix\Informix.lib : fatal error LNK1120: 2 unre
+solved externals
NMAKE : fatal error U1077: '"c:\Program Files (x86)\Microsoft Visual S
+tudio 10.0\VC\BIN\link.EXE"' : return code '0x460'
Stop.
[download]

I checked Informix.def and its contents are:

LIBRARY "Informix"
EXPORTS
  ifx_checkAPI
  _ifx_checkAPI = ifx_checkAPI
  boot_DBD__Informix
  _boot_DBD__Informix = boot_DBD__Informix
[download]

I have no idea what this file and its contents are supposed to do. You're right. This is a mess. I would like to clean it up but writing a new Makefile.PL is beyond my expertise. All I want to do is install the module and get on with my work.

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