diff --git a/src/mapper/Makefile b/src/mapper/Makefile
index 40e2e1934..9299bc72a 100644
--- a/src/mapper/Makefile
+++ b/src/mapper/Makefile
@@ -3,11 +3,11 @@ SUBDIRS =
 LIBRARY = 
 BINARY = mapper
 
+include ../Makefile.include
+
 SOURCES = $(wildcard *.c)
 OBJECTS = $(SOURCES:%.c=$(BUILD_DIR)/%.o)
 
-include ../Makefile.include
-
 ## more definitions
 
 INCLUDES  += \
@@ -27,6 +27,16 @@ LIBS      += \
 	-lcurses \
 	-lm
 
+##
+## conversion code for old triggers - should only be used for free eressea,
+## and only for old datafiles.
+##
+ifeq ($(CONVERT_TRIGGERS), 1)
+ SUBDIRS += old
+ LIBRARIES += $(PUBLISH_DIR)/libe-compat.a
+ LIBS += -le-compat
+endif
+
 # executable:
 $(BUILD_DIR)/$(BINARY):: $(BUILD_DIR) $(OBJECTS)
 	$(LD) -o $@ $(OBJECTS) $(LDFLAGS)