Проблема:

In file included from /home/user/openswan-2.6.24rc2/include/certs.h:
> 24,
> from /home/user/openswan-2.6.24rc2/lib/libopenswan/
> id.c:39:
> /home/user/openswan-2.6.24rc2/include/secrets.h:20:41: error: gmp.h:
> No such file or directory
> In file included from /home/user/openswan-2.6.24rc2/include/certs.h:
> 24,
> from /home/user/openswan-2.6.24rc2/lib/libopenswan/
> id.c:39:
> /home/user/openswan-2.6.24rc2/include/secrets.h:43: error: expected
> specifier-qualifier-list before 'MP_INT'
> /home/user/openswan-2.6.24rc2/include/secrets.h:54: error: expected
> specifier-qualifier-list before 'MP_INT'
> make[3]: *** [id.o] Error 1
> make[3]: Leaving directory `/home/user/openswan-2.6.24rc2/
> OBJ.linux.i386/lib/libopenswan'
> make[2]: *** [programs] Error 1
> make[2]: Leaving directory `/home/user/openswan-2.6.24rc2/
> OBJ.linux.i386/lib'
> make[1]: *** [programs] Error 1
> make[1]: Leaving directory `/home/user/openswan-2.6.24rc2/
> OBJ.linux.i386'
> make: *** [programs] Error 2

Решение:

Перед установкой Openswan необходимо установить следующие пакеты:

build-essential
libgmp3-dev
bison
libgmp
flex
xmlto
gcc

затем

#cd /usr/src
#wget http://openswan.org/download/openswan-2.6.35.tar.gz
#tar -xzf openswan-2.6.35.tar.gz
#cd /openswan-2.6.35
#make programs
#make install

проверка версии

#uname -a
KLIPS install for 2.0, 2.2, 2.4 or 2.6 kernels

    cd /usr/src/openswan-2.#.#
    export KERNELSRC=/usr/src/kernels/linux-2.6.18/
    make module
    make module_install