GDP

Naively installing on Mac OS X using brew, I got errors that openssl couldn't be found:

dhcp-45-14:gdp mellis$ make
#(cd doc;   make all)   # needs pandoc
(cd ep;     make all)
cc  -Wall -g -O  -I/opt/local/include -I. -I.. -fPIC   -c -o ep_adm.o ep_adm.c
cc  -Wall -g -O  -I/opt/local/include -I. -I.. -fPIC   -c -o ep_app.o ep_app.c
cc  -Wall -g -O  -I/opt/local/include -I. -I.. -fPIC   -c -o ep_assert.o ep_assert.c
cc  -Wall -g -O  -I/opt/local/include -I. -I.. -fPIC   -c -o ep_b64.o ep_b64.c
cc  -Wall -g -O  -I/opt/local/include -I. -I.. -fPIC   -c -o ep_crypto.o ep_crypto.c
In file included from ep_crypto.c:32:
./ep_crypto.h:43:11: fatal error: 'openssl/evp.h' file not found
# include <openssl/evp.h>
          ^
1 error generated.
make[1]: *** [ep_crypto.o] Error 1
make: *** [all] Error 2

I'm assuming this is because brew installs openssl to /usr/local but the Makefiles assume it's in /opt/local. It might be good to document the CRYPTOROOT in README-compiling.md, since this seems likely to affect many OS X brew users. Alternatively, maybe CRYPTOROOT (and LOCALROOT) can be set from the brew configuration?