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-rw-r--r--libemail-engine/e-mail-utils.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/libemail-engine/e-mail-utils.h b/libemail-engine/e-mail-utils.h
index a0ea188f9f..f055f3d6aa 100644
--- a/libemail-engine/e-mail-utils.h
+++ b/libemail-engine/e-mail-utils.h
@@ -19,6 +19,10 @@
*
*/
+#if !defined (__LIBEMAIL_ENGINE_H_INSIDE__) && !defined (LIBEMAIL_ENGINE_COMPILATION)
+#error "Only <libemail-engine/libemail-engine.h> should be included directly."
+#endif
+
#ifndef E_MAIL_UTILS_H
#define E_MAIL_UTILS_H