Forgot to include the necessary library package and configure option.

.travis.yml

@@ -28,6 +28,8 @@ install:
   - sudo apt-get install -y libldap2-dev libsasl2-dev
   # for memcache support
   - sudo apt-get install -y libmemcached-dev
+  # for redis support
+  - sudo apt-get install -y libhiredis-dev
   # for mod_sql_mysql
   - sudo apt-get install -y libmysqlclient-dev
   # for PAM support
@@ -59,7 +61,7 @@ before_script:
 script:
   # - find . -type f -name "*.c" -print | grep -v tests | xargs cppcheck 2>&1
   # - find . -type f -name "*.c" -print | grep -v tests | xargs rats --language=c
-  - ./configure LIBS=-lodbc --enable-devel=coverage --enable-ctrls --enable-facl --enable-memcache --enable-nls --enable-pcre --enable-tests --with-modules=mod_sql:mod_sql_mysql:mod_sql_odbc:mod_sql_postgres:mod_sql_sqlite:mod_sql_passwd:mod_sftp:mod_sftp_sql:mod_sftp_pam:mod_tls:mod_tls_fscache:mod_tls_shmcache:mod_tls_memcache:mod_ban:mod_copy:mod_ctrls_admin:mod_deflate:mod_dnsbl:mod_dynmasq:mod_exec:mod_facl:mod_geoip:mod_ifversion:mod_ldap:mod_load:mod_log_forensic:mod_qos:mod_quotatab:mod_quotatab_file:mod_quotatab_ldap:mod_quotatab_radius:mod_quotatab_sql:mod_radius:mod_readme:mod_rewrite:mod_shaper:mod_site_misc:mod_snmp:mod_wrap:mod_wrap2:mod_wrap2_file:mod_wrap2_sql:mod_digest:mod_auth_otp:mod_statcache:mod_ifsession
+  - ./configure LIBS=-lodbc --enable-devel=coverage --enable-ctrls --enable-facl --enable-memcache --enable-nls --enable-pcre --enable-redis --enable-tests --with-modules=mod_sql:mod_sql_mysql:mod_sql_odbc:mod_sql_postgres:mod_sql_sqlite:mod_sql_passwd:mod_sftp:mod_sftp_sql:mod_sftp_pam:mod_tls:mod_tls_fscache:mod_tls_shmcache:mod_tls_memcache:mod_ban:mod_copy:mod_ctrls_admin:mod_deflate:mod_dnsbl:mod_dynmasq:mod_exec:mod_facl:mod_geoip:mod_ifversion:mod_ldap:mod_load:mod_log_forensic:mod_qos:mod_quotatab:mod_quotatab_file:mod_quotatab_ldap:mod_quotatab_radius:mod_quotatab_sql:mod_radius:mod_readme:mod_rewrite:mod_shaper:mod_site_misc:mod_snmp:mod_wrap:mod_wrap2:mod_wrap2_file:mod_wrap2_sql:mod_digest:mod_auth_otp:mod_statcache:mod_ifsession
   - make
   - make TEST_VERBOSE=1 check-api
   - make clean