diff --git a/main/vcl/Library_vclplug_gen.mk b/main/vcl/Library_vclplug_gen.mk
index bcfa4ce..6bfe2b9 100644
--- a/main/vcl/Library_vclplug_gen.mk
+++ b/main/vcl/Library_vclplug_gen.mk
@@ -144,6 +144,7 @@ ifneq ($(OS),SOLARIS)
 # not Solaris
 $(eval $(call gb_Library_set_defs,vclplug_gen,\
        $$(DEFS) \
+       -DUSE_XINERAMA \
        -DUSE_XINERAMA_XORG \
 ))
 ifeq ($(XINERAMA_LINK),dynamic)
@@ -159,8 +160,10 @@ $(eval $(call gb_Library_set_ldflags,vclplug_gen,\
 endif
 else
 # Solaris
+foo
 $(eval $(call gb_Library_set_defs,vclplug_gen,\
        $$(DEFS) \
+       -DUSE_XINERAMA \
        -DUSE_XINERAMA_XSUN \
 ))
 ifeq ($(USE_XINERAMA_VERSION),Xorg)