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-rw-r--r--common/util.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/common/util.h b/common/util.h
index 24722227a..4d763f078 100644
--- a/common/util.h
+++ b/common/util.h
@@ -55,6 +55,13 @@
# define GPG_ERR_DNS_TIMEOUT 718
#endif
+#ifndef EXTERN_UNLESS_MAIN_MODULE
+# if !defined (INCLUDED_BY_MAIN_MODULE)
+# define EXTERN_UNLESS_MAIN_MODULE extern
+# else
+# define EXTERN_UNLESS_MAIN_MODULE
+# endif
+#endif
/* Hash function used with libksba. */
#define HASH_FNC ((void (*)(void *, const void*,size_t))gcry_md_write)