Running LOOL - openssl error

Hi all,


I'm trying to run LOOL and I execute the command "make run" I've this error:


make[2]: Entering directory '/home/renato/libreoffice/online'
  CXX      wsd/Admin.o
In file included from /opt/poco/include/Poco/Crypto/RSADigestEngine.h:21:0,
                 from wsd/Auth.hpp:17,
                 from wsd/Admin.cpp:24:
/opt/poco/include/Poco/Crypto/Crypto.h:30:30: fatal error: openssl/opensslv.h: No such file or 
directory
 #include <openssl/opensslv.h>
                              ^
compilation terminated.
Makefile:1192: recipe for target 'wsd/Admin.o' failed
make[2]: *** [wsd/Admin.o] Error 1
make[2]: Leaving directory '/home/renato/libreoffice/online'
Makefile:1742: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/renato/libreoffice/online'
Makefile:752: recipe for target 'all' failed
make: *** [all] Error 2

I don't understand what's happen because I had already run the application and everything works 
fine.
Could anyone explain me the origin of this error?

Thanks in advance.
Best regards