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-rw-r--r--ext/DB_File/Makefile.PL2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/DB_File/Makefile.PL b/ext/DB_File/Makefile.PL
index a247924ec8..cac6578bb3 100644
--- a/ext/DB_File/Makefile.PL
+++ b/ext/DB_File/Makefile.PL
@@ -16,7 +16,7 @@ WriteMakefile(
VERSION_FROM => 'DB_File.pm',
OBJECT => 'version$(OBJ_EXT) DB_File$(OBJ_EXT)',
XSPROTOARG => '-noprototypes',
- DEFINE => "$OS2",
+ DEFINE => $OS2 || "",
);
sub MY::postamble {