--- cmake/zlib.cmake.orig	2023-04-19 16:37:47.000000000 +0200
+++ cmake/zlib.cmake	2023-04-19 16:38:15.000000000 +0200
@@ -50,7 +50,7 @@ FUNCTION(FIND_ZLIB_VERSION ZLIB_INCLUDE_
   MESSAGE(STATUS "ZLIB_INCLUDE_DIR ${ZLIB_INCLUDE_DIR}")
 ENDFUNCTION(FIND_ZLIB_VERSION)
 
-FUNCTION(FIND_SYSTEM_ZLIB)
+MACRO(FIND_SYSTEM_ZLIB)
   FIND_PACKAGE(ZLIB)
   IF(ZLIB_FOUND)
     ADD_LIBRARY(zlib_interface INTERFACE)
@@ -61,7 +61,7 @@ FUNCTION(FIND_SYSTEM_ZLIB)
         ${ZLIB_INCLUDE_DIR})
     ENDIF()
   ENDIF()
-ENDFUNCTION(FIND_SYSTEM_ZLIB)
+ENDMACRO(FIND_SYSTEM_ZLIB)
 
 MACRO (RESET_ZLIB_VARIABLES)
   # Reset whatever FIND_PACKAGE may have left behind.