diff -Naupr js.orig/src/Makefile.ref js/src/Makefile.ref
--- js.orig/src/Makefile.ref	2006-07-26 21:16:47.000000000 +0200
+++ js/src/Makefile.ref	2007-11-20 22:03:59.000000000 +0100
@@ -63,11 +63,11 @@ INCLUDES   += -I$(OBJDIR)
 
 ifdef JS_THREADSAFE
 DEFINES += -DJS_THREADSAFE
-INCLUDES += -I$(DIST)/include/nspr
+INCLUDES += $(shell nspr-config --cflags)
 ifdef USE_MSVC
 OTHER_LIBS += $(DIST)/lib/libnspr$(NSPR_LIBSUFFIX).lib
 else
-OTHER_LIBS += -L$(DIST)/lib -lnspr$(NSPR_LIBSUFFIX)
+OTHER_LIBS += $(shell nspr-config --libs) -lm
 endif
 endif