From Rafa Gaitan and Jorge Izquierdo, build support for Android NDK.

"- In order to build against GLES1 we execute:
$ mkdir build_android_gles1
$ cd build_android_gles1
$ cmake .. -DOSG_BUILD_PLATFORM_ANDROID=ON -DDYNAMIC_OPENTHREADS=OFF
-DDYNAMIC_OPENSCENEGRAPH=OFF -DANDROID_NDK=<path_to_android_ndk>/
-DOSG_GLES1_AVAILABLE=ON -DOSG_GL1_AVAILABLE=OFF
-DOSG_GL2_AVAILABLE=OFF -DOSG_GL_DISPLAYLISTS_AVAILABLE=OFF -DJ=2
-DOSG_CPP_EXCEPTIONS_AVAILABLE=OFF
$ make
 If all is correct you will have and static OSG inside:
build_android_gles1/bin/ndk/local/armeabi.

- GLES2 is not tested/proved, but I think it could be possible build
it with the correct cmake flags.
- The flag -DJ=2 is used to pass to the ndk-build the number of
processors to speed up the building.
- make install is not yet supported."

PlatformSpecifics/Android/Android.mk.modules.in

@@ -0,0 +1,23 @@
+#ANDROID makefile   ${MODULE_NAME}
+
+LOCAL_PATH :=       ${MODULE_DIR}
+
+include $(CLEAR_VARS)
+
+LOCAL_CPP_EXTENSION := ${CPP_EXTENSION}
+
+LOCAL_LDLIBS :=     ${MODULE_LIBS}
+
+LOCAL_MODULE :=     ${MODULE_NAME}
+
+LOCAL_SRC_FILES :=  ${MODULE_SOURCES}
+
+LOCAL_C_INCLUDES := ${MODULE_INCLUDES}
+
+LOCAL_CFLAGS :=     ${MODULE_FLAGS_C}
+
+LOCAL_CPPFLAGS :=   ${MODULE_FLAGS_CPP}
+
+#include $(BUILD_STATIC_LIBRARY)
+include ${MODULE_BUILD_TYPE}
+