diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b68b0b7..6b71d3fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -122,6 +122,27 @@ if (NOT TARGET boost)
     target_include_directories(boost SYSTEM INTERFACE ${Boost_INCLUDE_DIRS})
 endif()
 
+if (DYNARMIC_NO_BUNDLED_FMT AND NOT TARGET fmt)
+    find_package(fmt REQUIRED)
+    add_library(fmt ALIAS fmt::fmt)
+endif()
+
+if (DYNARMIC_NO_BUNDLED_ROBIN_MAP AND NOT TARGET tsl::robin_map)
+    find_package(tsl-robin-map REQUIRED)
+endif()
+
+if (DYNARMIC_NO_BUNDLED_XBYAK AND NOT TARGET xbyak)
+    if (ARCHITECTURE STREQUAL "x86" OR ARCHITECTURE STREQUAL "x86_64")
+        find_package(xbyak REQUIRED)
+        add_library(xbyak ALIAS xbyak::xbyak)
+    endif()
+endif()
+
+if (DYNARMIC_NO_BUNDLED_ZYDIS AND NOT TARGET Zydis)
+    find_package(Zydis REQUIRED)
+    add_library(Zydis ALIAS Zydis::Zydis)
+endif()
+
 # Enable unit-testing.
 enable_testing(true)
 
@@ -137,6 +158,11 @@ if (DYNARMIC_TESTS_USE_UNICORN)
     find_package(Unicorn REQUIRED)
 endif()
 
+if (DYNARMIC_TESTS AND DYNARMIC_NO_BUNDLED_CATCH AND NOT TARGET catch)
+    find_package(Catch2 REQUIRED)
+    add_library(catch ALIAS Catch2::Catch2)
+endif()
+
 # Pull in externals CMakeLists for libs where available
 add_subdirectory(externals)
 
diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 5326e2e6..32d80773 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -4,12 +4,14 @@
 
 # catch
 
-add_library(catch INTERFACE)
-target_include_directories(catch INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/catch/include>)
+if (DYNARMIC_TESTS AND NOT TARGET catch)
+    add_library(catch INTERFACE)
+    target_include_directories(catch INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/catch/include>)
+endif()
 
 # fmt
 
-if (NOT DYNARMIC_NO_BUNDLED_FMT)
+if (NOT TARGET fmt)
     # fmtlib formatting library
     add_subdirectory(fmt)
 endif()
@@ -21,9 +23,11 @@ target_include_directories(mp INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE
 
 # robin-map
 
-add_library(robin_map INTERFACE)
-add_library(tsl::robin_map ALIAS robin_map)
-target_include_directories(robin_map SYSTEM INTERFACE "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/robin-map/include>")
+if (NOT TARGET tsl::robin_map)
+    add_library(robin_map INTERFACE)
+    add_library(tsl::robin_map ALIAS robin_map)
+    target_include_directories(robin_map SYSTEM INTERFACE "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/robin-map/include>")
+endif()
 
 # vixl
 
@@ -45,7 +49,9 @@ endif()
 
 # zydis
 
-option(ZYDIS_BUILD_TOOLS "" OFF)
-option(ZYDIS_BUILD_EXAMPLES "" OFF)
-set(ZYDIS_ZYCORE_PATH "${CMAKE_CURRENT_LIST_DIR}/zycore" CACHE PATH "")
-add_subdirectory(zydis EXCLUDE_FROM_ALL)
+if (NOT TARGET Zydis)
+    option(ZYDIS_BUILD_TOOLS "" OFF)
+    option(ZYDIS_BUILD_EXAMPLES "" OFF)
+    set(ZYDIS_ZYCORE_PATH "${CMAKE_CURRENT_LIST_DIR}/zycore" CACHE PATH "")
+    add_subdirectory(zydis EXCLUDE_FROM_ALL)
+endif()