File extra.mk.in artifact cf1b4ce92e part of check-in 4c6d6c56ac

ASPRINTF_C = @ASPRINTF_C@
OFPLUGIN = @OFPLUGIN@
OFPLUGIN_M = @OFPLUGIN_M@
WS2_LIBS = @WS2_LIBS@
TESTS = @TESTS@
TEST_LAUNCHER = @TEST_LAUNCHER@