diff -rupN piqi-0.6.12.orig/make/Makefile.ocaml piqi-0.6.12/make/Makefile.ocaml
--- piqi-0.6.12.orig/make/Makefile.ocaml	2015-03-13 13:35:19.000000000 +0100
+++ piqi-0.6.12/make/Makefile.ocaml	2015-06-10 21:19:57.231000000 +0200
@@ -1,13 +1,5 @@
 OCAMLMAKEFILE := $(PIQI_ROOT)/make/OCamlMakefile
 
-
-OCAMLPATH := $(PIQI_BUILD)/lib/ocaml
-ifeq ($(SYSTEM),$(filter $(SYSTEM),mingw mingw64))
-OCAMLPATH := $(shell cygpath -w $(OCAMLPATH))
-endif
-export OCAMLPATH
-
-
 # make sure camlp4o produces pretty-printed text instead of AST
 export CAMLP4_O = $(CAMLP4)o -printer o