diff --git a/CMakeLists.txt b/CMakeLists.txt
index d7ca937..ffcbe95 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1059,10 +1059,10 @@ endif()
 # except for building the ktx library.
 if((KTX_FEATURE_TOOLS OR KTX_FEATURE_TESTS) AND NOT TARGET fmt::fmt)
     set(FMT_SYSTEM_HEADERS ON)
-    add_subdirectory(other_projects/fmt)
+    find_package(fmt CONFIG REQUIRED)
 endif()
 if(KTX_FEATURE_TOOLS AND NOT TARGET cxxopts::cxxopts)
-    add_subdirectory(other_projects/cxxopts)
+    find_package(cxxopts CONFIG REQUIRED)
 endif()
 
 # Tools