Replaces find_package with find_dependency calls in pxrConfig.cmake.in.

Closes #3205

(Internal change: 2358834)

Author: theblackunknown

pxr/pxrConfig.cmake.in

@@ -16,6 +16,8 @@ set(PXR_MINOR_VERSION "@PXR_MINOR_VERSION@")
 set(PXR_PATCH_VERSION "@PXR_PATCH_VERSION@")
 set(PXR_VERSION "@PXR_VERSION@")
 
+include(CMakeFindDependencyMacro)
+
 # If Python support was enabled for this USD build, find the import
 # targets by invoking the appropriate FindPython module. Use the same
 # LIBRARY and INCLUDE_DIR settings from the original build if they
@@ -41,9 +43,9 @@ if(@PXR_ENABLE_PYTHON_SUPPORT@)
     endif()
 
     if (NOT DEFINED Python3_VERSION)
-        find_package(Python3 "@Python3_VERSION@" EXACT COMPONENTS Development REQUIRED)
+        find_dependency(Python3 "@Python3_VERSION@" EXACT COMPONENTS Development)
     else()
-        find_package(Python3 COMPONENTS Development REQUIRED)
+        find_dependency(Python3 COMPONENTS Development)
     endif()
 endif()
 
@@ -57,7 +59,7 @@ if(@PXR_ENABLE_MATERIALX_SUPPORT@)
             set(MaterialX_DIR [[@MaterialX_DIR@]])
         endif()
     endif()
-    find_package(MaterialX REQUIRED)
+    find_dependency(MaterialX)
 endif()
 
 # Similar to MaterialX above, we are using Imath's cmake package config, so set
@@ -71,7 +73,7 @@ if(@Imath_FOUND@)
             set(Imath_DIR [[@Imath_DIR@]])
         endif()
     endif()
-    find_package(Imath REQUIRED)
+    find_dependency(Imath)
 endif()
 
 include("${PXR_CMAKE_DIR}/cmake/pxrTargets.cmake")