diff --git a/make/proj.mk b/make/proj.mk
index 315ff3d..7ee6df2 100644
--- a/make/proj.mk
+++ b/make/proj.mk
@@ -5,6 +5,6 @@ PROJECTS_DIR        ?= $(TOPDIR)/..
 ifeq ($(TARGET),mingw)
 FLAVOUR_PATH_PREFIX  = win32/
 endif
-MODDIR               = $(firstword $(wildcard $(PROJECTS_DIR)/jw-build /opt/$(FLAVOUR_PATH_PREFIX)jw-build))
+MODDIR              ?= $(firstword $(wildcard $(PROJECTS_DIR)/jw-build $(BUILD_TOOLS_PREFIX)/opt/$(FLAVOUR_PATH_PREFIX)jw-build))
 
 USE_PROJECT_LIB      = false