Starting android developement on hd2

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Hi to all. after some years using roms made by other people i'd like to start working on android. i'd like to try do compile from zero an adroid bult, but i'm not sure of ome things.
i'm working on ubuntu 11.10
i donwloaded the android source and now i'm trying to compile it, but i can't for some reason.

firstly i don't know what version should i build to try it on the hd2. the choices are:
1. full-eng
2. full_x86-eng
3. vbox_x86-eng
4. full_maguro-userdebug
5. full_tuna-userdebug
6. full_panda-eng

then, every version i choose i recive this error:
/bin/bash: prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-gcc: Permesso negato
/bin/bash: prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-gcc: Permesso negato
/bin/bash: prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-gcc: Permesso negato
/bin/bash: build/core/find-jdk-tools-jar.sh: Permesso negato
build/core/config.mk:268: *** Error: could not find jdk tools.jar, please install JDK6, which you can download from java.sun.com. Arresto.

** Don't have a product spec for: 'full'
** Do you have the right repo manifest?

even if jdk is correctly installed.can someone help me?
am i completely astray? XD
thanks for your help and sorry for my english

ok i solved all those errors simply by checking in the files listed above "enable to execute like programs" (i don't exactly know what is the real translation in english). but the built still not arrive to the end. Is there a way to check automatically all the boxes so i'm sure that the errors aren't caused by that?



edit:
i solved that problem too, i did make -j4, it worked for 20 minutes and now:
In file included from external/oprofile/libpp/arrange_profiles.cpp:24:0:
external/oprofile/libpp/format_output.h:94:22: error: reference ‘counts’ cannot be declared ‘mutable’ [-fpermissive]
make: *** [out/host/linux-x86/obj/STATIC_LIBRARIES/liboprofile_pp_intermediates/arrange_profiles.o] Errore 1
make: *** Attesa per i processi non terminati....