--- openimageio-1.7.13/CMakeLists.txt.orig	2017-04-29 15:19:41.888720688 +0200
+++ openimageio-1.7.13/CMakeLists.txt.orig	2017-04-29 15:20:10.255529133 +0200
@@ -519,10 +519,10 @@ 
     endforeach ()
 endif ()
 
-if (USE_PYTHON AND boost_PYTHON_FOUND AND NOT BUILD_OIIOUTIL_ONLY)
+if (USE_PYTHON AND Boost_PYTHON_FOUND AND NOT BUILD_OIIOUTIL_ONLY)
     add_subdirectory (src/python)
 endif ()
-if (USE_PYTHON3 AND boost_PYTHON_FOUND AND NOT BUILD_OIIOUTIL_ONLY)
+if (USE_PYTHON3 AND Boost_PYTHON_FOUND AND NOT BUILD_OIIOUTIL_ONLY)
     #build the python3 module in a different binary directory since it will
     #have the same name as the python2 module (e.g. OpenImageIO.so)
     add_subdirectory (src/python src/python3)
--- openimageio-1.7.13/src/cmake/externalpackages.cmake.orig	2017-04-29 15:39:28.055972762 +0200
+++ openimageio-1.7.13/src/cmake/externalpackages.cmake.orig	2017-04-29 15:41:19.813295317 +0200
@@ -135,6 +135,10 @@ 
                   COMPONENTS ${Boost_COMPONENTS}
                  )
 
+	if (CMAKE_GENTOO_BUILD OR CMAKE_BUILD_TYPE STREQUAL Gentoo)
+	    # Gentoo's patches to CMake make sure that we will always find exactly the version of Python required by Gentoo
+		find_package (Boost 1.42 COMPONENTS ${Boost_COMPONENTS} python)
+	else ()
     # Try to figure out if this boost distro has Boost::python.  If we
     # include python in the component list above, cmake will abort if
     # it's not found.  So we resort to checking for the boost_python
@@ -172,10 +176,11 @@ 
     endif ()
     if (my_boost_python_lib OR
         my_boost_PYTHON_LIBRARY_RELEASE OR my_boost_PYTHON_LIBRARY_DEBUG)
-        set (boost_PYTHON_FOUND ON)
+        set (Boost_PYTHON_FOUND ON)
     else ()
-        set (boost_PYTHON_FOUND OFF)
+        set (Boost_PYTHON_FOUND OFF)
     endif ()
+	endif ()
 endif ()
 
 # On Linux, Boost 1.55 and higher seems to need to link against -lrt
@@ -190,9 +195,9 @@ 
     message (STATUS "Boost include dirs ${Boost_INCLUDE_DIRS}")
     message (STATUS "Boost library dirs ${Boost_LIBRARY_DIRS}")
     message (STATUS "Boost libraries    ${Boost_LIBRARIES}")
-    message (STATUS "Boost python found ${boost_PYTHON_FOUND}")
+    message (STATUS "Boost python found ${Boost_PYTHON_FOUND}")
 endif ()
-if (NOT boost_PYTHON_FOUND)
+if (NOT Boost_PYTHON_FOUND)
     # If Boost python components were not found, turn off all python support.
     message (STATUS "Boost python support not found -- will not build python components!")
     if (APPLE AND USE_PYTHON)
--- openimageio-1.7.13/src/python/CMakeLists.txt.orig	2017-04-29 15:05:07.117933355 +0200
+++ openimageio-1.7.13/src/python/CMakeLists.txt.orig	2017-04-29 15:07:50.747700197 +0200
@@ -8,7 +8,14 @@ 
     set (BUILD_PY3 OFF)
 endif ()
 
-if (NOT BOOST_CUSTOM AND NOT BUILD_PY3)
+if (CMAKE_GENTOO_BUILD OR CMAKE_BUILD_TYPE STREQUAL Gentoo)
+	# Gentoo's patches to CMake make sure that we will always find exactly the version of Python required by Gentoo
+	if (BUILD_PY3)
+    	find_package (PythonInterp ${PYTHON3_VERSION} REQUIRED)
+    	find_package (PythonLibs ${PYTHON3_VERSION} REQUIRED)
+	endif ()
+    find_package (Boost 1.42 REQUIRED COMPONENTS python)
+elseif (NOT BOOST_CUSTOM AND NOT BUILD_PY3)
     #Unset those, otherwise find_package(PythonLibs) will pick up old stuff
     #if it has been run before
     unset(Python_ADDITIONAL_VERSIONS)