I am having this issue with guacamole-server-0.9.13:
make[2]: Entering directory '/home/tc/Downloads/guacamole-server-0.9.13-incubating/src/common-ssh'
CC libguac_common_ssh_la-sftp.lo
In file included from common-ssh/sftp.h:24:0,
...
make[2]: Entering directory '/home/tc/Downloads/guacamole-server-0.9.13-incubating/src/common-ssh'
CC libguac_common_ssh_la-sftp.lo
In file included from common-ssh/sftp.h:24:0,
...