That sounds awfully microsoftish and totally un-mingw-ish

Maybe you should compile libdb yourself using your mingw toolkig, it works for me

Or if you DuckDuckGo

Install_DB_File_on_Strawberry_Perl

How to install DB_File on Strawberry Perl

Download and install the Oracle/Sleepycat libdb MSI:

berkeley-db db-5.2.36.msi

Go to the Berkeley DB directory:

e.g. C:\Program Files\Oracle\Berkeley DB 4.6.21

Copy the include directory to \strawberry\c\include\db:

Copy the lib\libdb46.lib file to \strawberry\c\lib\libdb.a:

Comment out two typedefs in \strawberry\c\include\db\db.h

    --- db.h    Wed Oct 03 16:23:20 2007
    +++ db.h    Fri Apr 04 19:13:28 2008
    @@ -115,7 +115,7 @@
     #ifdef _WIN64
     typedef u_int64_t uintptr_t;
     #else
    -typedef u_int32_t uintptr_t;
    +/*typedef u_int32_t uintptr_t;*/
     #endif
     
     /*
    @@ -128,7 +128,7 @@
     #ifdef _WIN64
     typedef int64_t ssize_t;
     #else
    -typedef int32_t ssize_t;
    +/*typedef int32_t ssize_t;*/
     #endif
     
     /*
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Go to the DB_File distribution directory:

edit config.in to update the locations and DB name:

 INCLUDE = \strawberry\c\include\db
 LIB     = \strawberry\c\lib
 DBNAME  = -ldb
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Run Makefile.PL, make and make test as normal: