diff --git a/CMakeLists.txt b/CMakeLists.txt
index 52d2953..d132d26 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -80,6 +80,7 @@ install(
 install(
     DIRECTORY "${HEADER_BASE}/${PROJECT_NAME}"
     DESTINATION "${include_install_dir}"
+    PATTERN "bundled*" EXCLUDE
 )
 
 # install project version file
diff --git a/include/spdlog/fmt/fmt.h b/include/spdlog/fmt/fmt.h
index 92ca4e5..55f1fa8 100644
--- a/include/spdlog/fmt/fmt.h
+++ b/include/spdlog/fmt/fmt.h
@@ -10,25 +10,7 @@
 // By default spdlog include its own copy.
 //
 
-#if !defined(SPDLOG_FMT_EXTERNAL)
-
-#ifndef FMT_HEADER_ONLY
-#define FMT_HEADER_ONLY
-#endif
-#ifndef FMT_USE_WINDOWS_H
-#define FMT_USE_WINDOWS_H 0
-#endif
-#include "bundled/format.h"
-#if defined(SPDLOG_FMT_PRINTF)
-#include "bundled/printf.h"
-#endif
-
-#else //external fmtlib
-
 #include <fmt/format.h>
 #if defined(SPDLOG_FMT_PRINTF)
 #include <fmt/printf.h>
 #endif
-
-#endif
-
diff --git a/include/spdlog/fmt/ostr.h b/include/spdlog/fmt/ostr.h
index 5cdd5cd..d70c6b3 100644
--- a/include/spdlog/fmt/ostr.h
+++ b/include/spdlog/fmt/ostr.h
@@ -7,11 +7,6 @@
 
 // include external or bundled copy of fmtlib's ostream support
 //
-#if !defined(SPDLOG_FMT_EXTERNAL)
-#include "fmt.h"
-#include "bundled/ostream.h"
-#else
 #include <fmt/ostream.h>
-#endif
 
 
diff --git a/include/spdlog/tweakme.h b/include/spdlog/tweakme.h
index ad01a09..9a1bec4 100644
--- a/include/spdlog/tweakme.h
+++ b/include/spdlog/tweakme.h
@@ -98,14 +98,6 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 
-///////////////////////////////////////////////////////////////////////////////
-// Uncomment to use your own copy of the fmt library instead of spdlog's copy.
-// In this case spdlog will try to include <fmt/format.h> so set your -I flag accordingly.
-//
-// #define SPDLOG_FMT_EXTERNAL
-///////////////////////////////////////////////////////////////////////////////
-
-
 ///////////////////////////////////////////////////////////////////////////////
 // Uncomment to use printf-style messages in your logs instead of the usual
 // format-style used by default.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 22329b4..44dad86 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -13,7 +13,7 @@ target_include_directories(catch INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
 file(GLOB catch_tests LIST_DIRECTORIES false RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.cpp *.h *.hpp)
 
 add_executable(catch_tests ${catch_tests})
-target_link_libraries(catch_tests spdlog ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries(catch_tests spdlog fmt ${CMAKE_THREAD_LIBS_INIT})
 add_test(NAME catch_tests COMMAND catch_tests)
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/logs")