diff -ruN opencv-2.4.5-1-gentoo/CMakeLists.txt opencv-2.4.5/CMakeLists.txt
--- opencv-2.4.5-1-gentoo/CMakeLists.txt	2013-04-05 11:00:20.000000000 +0200
+++ opencv-2.4.5/CMakeLists.txt	2013-05-02 18:38:59.412094714 +0200
@@ -147,6 +147,7 @@
 OCV_OPTION(WITH_OPENCL         "Include OpenCL Runtime support"              ON   IF (NOT ANDROID AND NOT IOS) )
 OCV_OPTION(WITH_OPENCLAMDFFT   "Include AMD OpenCL FFT library support"      ON   IF (NOT ANDROID AND NOT IOS) )
 OCV_OPTION(WITH_OPENCLAMDBLAS  "Include AMD OpenCL BLAS library support"     ON   IF (NOT ANDROID AND NOT IOS) )
+OCV_OPTION(WITH_JAVA           "Include Java support"                        ON)
 
 
 # OpenCV build components
@@ -395,6 +396,8 @@
 include(cmake/OpenCVDetectPython.cmake)
 
 # --- Java Support ---
+if(WITH_JAVA)
+
 include(cmake/OpenCVDetectApacheAnt.cmake)
 if(ANDROID)
   include(cmake/OpenCVDetectAndroidSDK.cmake)
@@ -412,6 +415,11 @@
   SET(CAN_BUILD_ANDROID_PROJECTS FALSE)
 endif()
 
+else()
+  SET(ANT_EXECUTABLE "")
+  SET(CAN_BUILD_ANDROID_PROJECTS FALSE)
+endif()
+
 # --- OpenCL ---
 if(WITH_OPENCL)
   include(cmake/OpenCVDetectOpenCL.cmake)