diff --git a/cmake/Dependencies.cmake b/cmake/Dependencies.cmake
index c823a14ea..5d063a5e3 100644
--- a/cmake/Dependencies.cmake
+++ b/cmake/Dependencies.cmake
@@ -60,8 +60,10 @@ function(search_dependency pkg)
   # Last, search for the library itself globally.
   if(NOT ${pkg}_FOUND AND arg_LIBRARY)
     find_library(${pkg}_LIBRARIES NAMES ${arg_LIBRARY})
-    find_path(${pkg}_INCLUDE_DIRS NAMES ${arg_HEADER})
-    if(${pkg}_LIBRARIES AND ${pkg}_INCLUDE_DIRS)
+    if(arg_HEADER)
+        find_path(${pkg}_INCLUDE_DIRS NAMES ${arg_HEADER})
+    endif()
+    if(${pkg}_LIBRARIES AND (${pkg}_INCLUDE_DIRS OR NOT arg_HEADER))
       set(${pkg}_FOUND TRUE)
     endif()
   endif()