diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b274c8..50b9e4f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,9 @@ project(usdtweak)
 find_package(OpenGL REQUIRED)
 find_package(pxr REQUIRED)
 if (${PXR_VERSION} VERSION_GREATER_EQUAL 2208)
+    if(UNIX)
+        find_package(X11 REQUIRED)
+    endif()
     find_package(MaterialX)
 endif()
 set(CMAKE_CXX_STANDARD 14)