Backwards-compatible HAVE_DGL

Signed-off-by: falkTX <falktx@falktx.com>

Makefile.base.mk

@@ -313,6 +313,19 @@ LIBLO_FLAGS  = $(shell $(PKG_CONFIG) --cflags liblo)
 LIBLO_LIBS   = $(shell $(PKG_CONFIG) --libs liblo)
 endif
 
+# ---------------------------------------------------------------------------------------------------------------------
+# Backwards-compatible HAVE_DGL
+
+ifeq ($(MACOS_OR_WINDOWS),true)
+HAVE_DGL = true
+else ifeq ($(HAVE_OPENGL),true)
+ifeq ($(HAIKU),true)
+HAVE_DGL = true
+else
+HAVE_DGL = $(HAVE_X11)
+endif
+endif
+
 # ---------------------------------------------------------------------------------------------------------------------
 # Set app extension