Makefile missing

[Arnoud Tijssen <Atijssen@ram-it.nl>]

I`m trying to compile openswan 2.6.39 from source on to a up-to-date Debian Wheezy system (7.1).
In the final step I keep getting this error:

make[5]: /usr/src/linux-headers-3.2.0-4-common/scripts/kconfig/Makefile: No such file or directory
make[5]: *** No rule to make target `/usr/src/linux-headers-3.2.0-4-common/scripts/kconfig/Makefile'.  Stop.
make[4]: *** [help] Error 2
make[3]: *** [sub-make] Error 2
make[2]: *** [all] Error 2

I`ve installed : gcc make linux-headers-3.2.0-4-amd64 libgmp3-dev libssl-dev libldap2-dev libpam0g-dev bison flex dkms
Any help to resolve this issue is highly appreciated.

Greets,
Arnoud