Hello,
I'm compiling with:

./configure --prefix=/xxx/gnome2 --disable-gtk-doc --enable-vala-bindings --disable-goa --disable-ssl --disable-smime --disable-weather --disable-calendar

And I get the following error on make:

Making all in camel
make[2]: Entering directory `/xxx/evolution-data-server/camel'
make  all-recursive
make[3]: Entering directory `/xxx/evolution-data-server/camel'
Making all in .
make[4]: Entering directory `/xxx/evolution-data-server/camel'
  CC     libcamel_1_2_la-camel.lo
In file included from camel.h:124:0,
                 from camel.c:40:
../camel/camel-tcp-stream.h:47:18: fatal error: prio.h: No such file or directory
compilation terminated.
make[4]: *** [libcamel_1_2_la-camel.lo] Error 1
make[4]: Leaving directory `/xxx/evolution-data-server/camel'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/xxx/evolution-data-server/camel'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/xxx/evolution-data-server/camel'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/xxx/evolution-data-server'
make: *** [all] Error 2

I see prio.h is included in nspr which is needed by --enable-ssl, so I thought libcamel need nspr, but I'm not sure.