2 files changed, 12 insertions, 0 deletions
diff --git a/src/shared/missing.h b/src/shared/missing.h
index 2dc9d842d3..9031119a45 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -158,3 +158,14 @@ static inline int name_to_handle_at(int fd, const char *name, struct file_handle
 #ifndef AT_EMPTY_PATH
 #define AT_EMPTY_PATH 0x1000
 #endif
+
+#if !HAVE_DECL_STRNDUPA
+#define strndupa(s, n) \
+  ({ \
+    const char *__old = (s); \
+    size_t __len = strnlen(__old, (n)); \
+    char *__new = (char *)alloca(__len + 1); \
+    __new[__len] = '\0'; \
+    (char *)memcpy(__new, __old, __len); \
+  })
+#endif
diff --git a/src/shared/selinux-util.c b/src/shared/selinux-util.c
index 4e0866be5f..a18a5a7230 100644
--- a/src/shared/selinux-util.c
+++ b/src/shared/selinux-util.c
@@ -31,6 +31,7 @@
 #include "strv.h"
 #include "path-util.h"
 #include "selinux-util.h"
+#include "missing.h"
 
 #ifdef HAVE_SELINUX
 DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);