_LIBS is not a libtool variable, thus the remotebackend module does not
get linked to libcurl. Fix this by using _LIBADD instead.
libremotebackend_la_SOURCES=remotebackend.hh remotebackend.cc unixconnector.cc httpconnector.cc pipeconnector.cc
libremotebackend_la_LDFLAGS=-module -avoid-version
-libremotebackend_la_LIBS=$(LIBCURL_LIBS)
+libremotebackend_la_LIBADD=$(LIBCURL_LIBS)
TESTS_ENVIRONMENT = env BOOST_TEST_LOG_LEVEL=message REMOTEBACKEND_HTTP=$(REMOTEBACKEND_HTTP) ./testrunner.sh
TESTS=test_remotebackend_pipe test_remotebackend_unix test_remotebackend_http test_remotebackend_post test_remotebackend_json