zxing-cpp 1.4.0 startd to only install the headers to the public interface.
Libreoffice is unfortunately depending on some internal parts.

--- core/CMakeLists.txt.orig	2022-08-27 06:46:09 UTC
+++ core/CMakeLists.txt
@@ -141,6 +141,7 @@ set (PUBLIC_HEADERS
 # define subset of public headers that get distributed with the binaries
 set (PUBLIC_HEADERS
     src/BarcodeFormat.h
+    src/BitArray.h # expose private header used by Libreoffice
     src/BitHacks.h
     src/ByteArray.h
     src/CharacterSet.h