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."

include/osg/BufferObject

@@ -77,7 +77,7 @@
     #if defined(_WIN64)
         typedef __int64 GLintptr;
         typedef __int64 GLsizeiptr;
-    #elif defined(__ia64__) || defined(__x86_64__)
+    #elif defined(__ia64__) || defined(__x86_64__) || defined(ANDROID)
         typedef long int GLintptr;
         typedef long int GLsizeiptr;
     #else

include/osgDB/ConvertUTF

@@ -19,7 +19,7 @@
 
 #include <string>
 
-#ifdef __CYGWIN__
+#if defined(__CYGWIN__) || defined(ANDROID)
 namespace std
 {
 typedef basic_string<wchar_t> wstring;