Index: res/pjproject/build.mak.in
===================================================================
--- res/pjproject/build.mak.in	(revision 398225)
+++ res/pjproject/build.mak.in	(working copy)
@@ -1,4 +1,4 @@
-export PJDIR := @ac_pjdir@
+export PJDIR := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 include $(PJDIR)/version.mak
 export PJ_DIR := $(PJDIR)