diff --git a/Makefile.base.mk b/Makefile.base.mk
index 83ef5c45..ea4d0547 100644
--- a/Makefile.base.mk
+++ b/Makefile.base.mk
@@ -217,9 +217,11 @@ DGL_SYSTEM_LIBS  += -lgdi32
 endif
 
 ifneq ($(HAIKU_OR_MACOS_OR_WINDOWS),true)
+ifeq ($(HAVE_X11),true)
 DGL_FLAGS        += $(shell $(PKG_CONFIG) --cflags x11)
 DGL_SYSTEM_LIBS  += $(shell $(PKG_CONFIG) --libs x11)
 endif
+endif
 
 # ---------------------------------------------------------------------------------------------------------------------
 # Set Cairo specific stuff