Commit 3d0b151e for libheif

commit 3d0b151ef832a0cd0dc3dc8491c4eebec5a5c68f
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Fri Jan 23 11:34:26 2026 +0100

    set  when unavailable (#1678)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93bbafbc..e593f065 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -147,6 +147,8 @@ if (WITH_KVAZAAR)
     endif ()
     if (HAVE_KVAZAAR_VERSION_STRING)
         add_definitions(-DHAVE_KVAZAAR_VERSION_STRING=1)
+    else ()
+        add_definitions(-DHAVE_KVAZAAR_VERSION_STRING=0)
     endif ()
 endif ()