diff --git a/Makefile b/Makefile
index 37589e1..10d3418 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@ OPALANG_DIR ?= .
 
 MAKE ?= $_
 OCAMLBUILD_OPT ?= -j 6
+OCAMLBUILD_OPT += -use-ocamlfind -package num
 
 ifndef NO_REBUILD_OPA_PACKAGES
 OPAOPT += --rebuild
diff --git a/_tags b/_tags
index 5d8d922..b6bdd5e 100644
--- a/_tags
+++ b/_tags
@@ -15,4 +15,4 @@
 <{ocamllib,compiler,lib,tools}>: include
 
 # Warnings
-<**/*.ml>: warn_L, warn_Z, warn_error_A
+<**/*.ml>: warn_L, warn_Z
diff --git a/compiler/_tags b/compiler/_tags
index b33eeeb..7afa493 100644
--- a/compiler/_tags
+++ b/compiler/_tags
@@ -7,6 +7,6 @@
 
 <main.ml>: use_opalib, use_opalang, use_opapasses, use_libqmlcompil, use_passlib, use_libbsl, use_qmloptions, use_qml2js, use_js_passes, use_opa
 
-<main.{byte,native}>: thread, use_dynlink, use_graph, use_str, use_unix, use_nums, use_zip, use_buildinfos, use_libbase, use_ulex, use_libtrx, use_libqmlcompil, use_libbsl, use_opalib, use_opalang, use_opapasses, use_qmlfakecompiler, use_qmloptions, use_qmljsimp, use_qml2js, use_opabsl_for_compiler, use_qmlslicer, use_jslang, use_qmlcpsrewriter, use_ocamllang, use_passlib, use_compilerlib, use_pplib, use_qmlpasses, use_opacapi, use_js_passes, use_opa
+<main.{byte,native}>: thread, use_dynlink, use_graph, use_str, use_zip, use_buildinfos, use_libbase, use_ulex, use_libtrx, use_libqmlcompil, use_libbsl, use_opalib, use_opalang, use_opapasses, use_qmlfakecompiler, use_qmloptions, use_qmljsimp, use_qml2js, use_opabsl_for_compiler, use_qmlslicer, use_jslang, use_qmlcpsrewriter, use_ocamllang, use_passlib, use_compilerlib, use_pplib, use_qmlpasses, use_opacapi, use_js_passes, use_opa
 
 <main.ml>: with_mlstate_debug
diff --git a/compiler/jslang/_tags b/compiler/jslang/_tags
index f33b592..8925703 100644
--- a/compiler/jslang/_tags
+++ b/compiler/jslang/_tags
@@ -4,7 +4,7 @@
 <jsParse.ml>:           use_camlp4, camlp4orf_fixed
 
 # todo: find a way to link fewer libs
-<{jspp,jsstat,globalizer}.{byte,native}>: use_passlib, use_opacapi, use_libtrx, use_ulex, use_str, use_unix, use_buildinfos, use_libbase, use_libqmlcompil, use_compilerlib, use_graph, use_nums, use_dynlink, use_jslang, use_ocamllang, use_libbsl, use_opalang, use_pplib, use_qmloptions, use_qml2js, use_qmlcpsrewriter, use_qmlpasses
+<{jspp,jsstat,globalizer}.{byte,native}>: use_passlib, use_opacapi, use_libtrx, use_ulex, use_str, use_unix, use_buildinfos, use_libbase, use_libqmlcompil, use_compilerlib, use_graph, use_dynlink, use_jslang, use_ocamllang, use_libbsl, use_opalang, use_pplib, use_qmloptions, use_qml2js, use_qmlcpsrewriter, use_qmlpasses
 <{jspp,jsstat,globalizer}.{ml,byte,native}>: use_qmljsimp
 
 <jsstat.{ml,byte,native}>: use_libjsminify
diff --git a/compiler/libbsl/_tags b/compiler/libbsl/_tags
index cad1fe4..8ef238b 100644
--- a/compiler/libbsl/_tags
+++ b/compiler/libbsl/_tags
@@ -20,7 +20,7 @@
 <bslRegisterParser.{ml,mli,byte,native}>: use_libtrx
 <bslTinyShell.{ml,mli,byte,native}>: use_libtrx
 <bslregister.*>: use_jslang
-<bslregister.{byte,native}>: use_ulex, use_libbsl, use_dynlink, use_zip, use_nums
+<bslregister.{byte,native}>: use_ulex, use_libbsl, use_dynlink, use_zip
 <portingBsl.{ml,byte,native}>: use_ulex, use_libbsl, use_dynlink, use_zip, use_nums
 <bslGeneration.{ml,mli}>: use_ulex, use_dynlink, use_zip, use_nums, use_jslang
 <bslMarshalPlugin.*>: use_jslang
@@ -30,7 +30,7 @@
 <tests>: ignore
 
 # applications, linking
-<*.{byte,native}>:use_buildinfos, use_ulex, use_libtrx, use_dynlink, use_unix, thread, use_graph, use_libbsl, use_passlib, use_zip, use_nums, use_opalang, use_ocamllang, use_langlang, use_jslang, use_opacapi
+<*.{byte,native}>:use_buildinfos, use_ulex, use_libtrx, use_dynlink, thread, use_graph, use_libbsl, use_passlib, use_zip, use_opalang, use_ocamllang, use_langlang, use_jslang, use_opacapi
 
 # ppdebug (pl. be very specific with the use of ppdebug)
 <bslLib.ml*>        : with_mlstate_debug
diff --git a/compiler/opa/_tags b/compiler/opa/_tags
index cfe97a1..702af34 100644
--- a/compiler/opa/_tags
+++ b/compiler/opa/_tags
@@ -62,7 +62,7 @@
 <syntaxHelper.ml>: use_opalib, use_opalang, use_opapasses, use_libqmlcompil, use_passlib
 
 # linking
-<{opa_parse,checkopacapi,gen_opa_manpage,syntaxHelper}.{byte,native}>: thread, use_dynlink, use_graph, use_str, use_unix, use_nums, use_zip, use_buildinfos, use_libbase, use_ulex, use_libtrx, use_libqmlcompil, use_libbsl, use_opalib, use_opalang, use_opapasses, use_qmlfakecompiler, use_qmljsimp, use_qml2js, use_opabsl_for_compiler, use_qmlslicer, use_jslang, use_qmlcpsrewriter, use_ocamllang, use_passlib, use_compilerlib, use_pplib, use_qmlpasses, use_opacapi, use_qmloptions
+<{opa_parse,checkopacapi,gen_opa_manpage,syntaxHelper}.{byte,native}>: thread, use_dynlink, use_graph, use_str, use_zip, use_buildinfos, use_libbase, use_ulex, use_libtrx, use_libqmlcompil, use_libbsl, use_opalib, use_opalang, use_opapasses, use_qmlfakecompiler, use_qmljsimp, use_qml2js, use_opabsl_for_compiler, use_qmlslicer, use_jslang, use_qmlcpsrewriter, use_ocamllang, use_passlib, use_compilerlib, use_pplib, use_qmlpasses, use_opacapi, use_qmloptions
 
 <opa_InsertRemote.ml>: with_mlstate_debug
 <main_utils.ml>: with_mlstate_debug
diff --git a/compiler/opalang/_tags b/compiler/opalang/_tags
index 6844281..8f0eaec 100644
--- a/compiler/opalang/_tags
+++ b/compiler/opalang/_tags
@@ -14,7 +14,7 @@ true: warn_Z
 <standaloneparser.ml>: use_buildinfos, use_compilerlib, use_pplib
 <**/*.{ml,mli}>: use_libbase, use_compilerlib, use_libqmlcompil, use_passlib
 
-<{opa2opa,standaloneparser}.{native,byte}>: use_unix, use_libbase, use_mutex, use_graph, use_str, use_zlib, thread, use_nums, use_libtrx, use_passlib, use_libqmlcompil, use_buildinfos, use_ulex, use_compilerlib, use_pplib, use_opacapi
+<{opa2opa,standaloneparser}.{native,byte}>: use_libbase, use_mutex, use_graph, use_str, use_zlib, thread, use_libtrx, use_passlib, use_libqmlcompil, use_buildinfos, use_ulex, use_compilerlib, use_pplib, use_opacapi
 
 <opaMapToIdent.ml>: use_opacapi
 <surfaceAstCons.ml>: use_opacapi
diff --git a/compiler/opx2js/_tags b/compiler/opx2js/_tags
index 7e9b9cc..3e257ea 100644
--- a/compiler/opx2js/_tags
+++ b/compiler/opx2js/_tags
@@ -2,7 +2,7 @@
 
 <**/*.{ml,mli}>: use_buildinfos, use_libbase, use_compilerlib, use_passlib
 
-<**/*.native>: thread, use_dynlink, use_graph, use_str, use_unix, use_nums, use_zip, use_buildinfos, use_libbase, use_ulex, use_libtrx, use_libqmlcompil, use_libbsl, use_opalib, use_opalang, use_opapasses, use_qmlfakecompiler, use_qmlflatcompiler, use_qmloptions, use_qmljsimp, use_qml2js, use_opabsl_for_compiler, use_qmlslicer, use_jslang, use_qmlcpsrewriter, use_ocamllang, use_passlib, use_compilerlib, use_pplib, use_qmlpasses, use_opacapi, use_libopa
+<**/*.native>: thread, use_dynlink, use_graph, use_str, use_zip, use_buildinfos, use_libbase, use_ulex, use_libtrx, use_libqmlcompil, use_libbsl, use_opalib, use_opalang, use_opapasses, use_qmlfakecompiler, use_qmlflatcompiler, use_qmloptions, use_qmljsimp, use_qml2js, use_opabsl_for_compiler, use_qmlslicer, use_jslang, use_qmlcpsrewriter, use_ocamllang, use_passlib, use_compilerlib, use_pplib, use_qmlpasses, use_opacapi, use_libopa
 
 <**/opx2jsPasses.{ml,mli}>: use_jslang, use_opalib, use_opalang, use_opapasses, use_libopa, use_libqmlcompil, use_qmlpasses, use_qmlcpsrewriter, use_qmlslicer
 
diff --git a/compiler/passes/_tags b/compiler/passes/_tags
index a0daff4..9644d3a 100644
--- a/compiler/passes/_tags
+++ b/compiler/passes/_tags
@@ -1,7 +1,7 @@
 # -*- conf -*- (for emacs)
 
 # preprocessing
-true: with_mlstate_debug, warn_A, warn_e, warn_error_A, warnno_48
+true: with_mlstate_debug, warn_A, warn_e, warnno_48
 
 <**/*.{ml,mli}>: use_libbase, use_libqmlcompil, use_passlib, use_opalang, use_compilerlib, use_opacapi
 <surfaceAst*.{ml,mli}>: use_opalib, use_libbsl
diff --git a/compiler/passlib/_tags b/compiler/passlib/_tags
index 2b9cfcf..5cb3145 100644
--- a/compiler/passlib/_tags
+++ b/compiler/passlib/_tags
@@ -1,6 +1,6 @@
 # -*- conf -*- (for emacs)
 
-<*.{ml,mli,byte,native}>: use_libbase, use_compilerlib, thread, use_ulex, use_unix, use_str
+<*.{ml,mli,byte,native}>: use_libbase, use_compilerlib, thread, use_ulex, use_str
 
 <passHandler.ml>: use_buildinfos
 <passdesign.{byte,native}>: use_buildinfos, use_graph
diff --git a/compiler/qmlcompilers/_tags b/compiler/qmlcompilers/_tags
index 087165c..87ae918 100644
--- a/compiler/qmlcompilers/_tags
+++ b/compiler/qmlcompilers/_tags
@@ -5,7 +5,7 @@
 
 # application, linkink
 # common
-<{qmljs_exe}.{ml,mli,byte,native}>: thread, use_unix, use_dynlink, use_str, use_graph, use_ulex, use_libtrx, use_pplib, use_opabsl_for_compiler, use_passlib, use_nums, use_buildinfos, use_opalang, use_compilerlib, use_opacapi
+<{qmljs_exe}.{ml,mli,byte,native}>: thread, use_dynlink, use_str, use_graph, use_ulex, use_libtrx, use_pplib, use_opabsl_for_compiler, use_passlib, use_buildinfos, use_opalang, use_compilerlib, use_opacapi
 
 # specific
 <qmljs_exe.{ml,byte,native}>: use_qmljsimp, use_qml2js, use_zip
diff --git a/ocamllib/libbase/_tags b/ocamllib/libbase/_tags
index 42d067d..6b7e690 100644
--- a/ocamllib/libbase/_tags
+++ b/ocamllib/libbase/_tags
@@ -27,4 +27,4 @@
 <mongo.ml>: with_mlstate_debug
 
 
-<{testconsole,testfilepos}.{ml,mli,byte,native}>: thread, use_str, use_unix, use_libbase, use_ulex
+<{testconsole,testfilepos}.{ml,mli,byte,native}>: thread, use_str, use_libbase, use_ulex
diff --git a/tools/_tags b/tools/_tags
index 549752b..44c97b3 100644
--- a/tools/_tags
+++ b/tools/_tags
@@ -8,7 +8,7 @@
 <build>: include
 
 # Odep
-<odep*.{ml,byte,native}>: thread, use_str, use_unix, use_graph, use_zip, use_libbase, use_ulex
+<odep*.{ml,byte,native}>: thread, use_str, use_graph, use_zip, use_libbase, use_ulex
 
 ###
 # Ofile
@@ -16,7 +16,7 @@
 <ofile.ml>: use_libbase
 
 # linking
-<ofile.{byte,native}>: use_unix, use_str, thread, use_ulex, use_libbase, use_zip
+<ofile.{byte,native}>: use_str, thread, use_ulex, use_libbase, use_zip
 
 ###
 # jschecker
diff --git a/tools/teerex/_tags b/tools/teerex/_tags
index d662b49..366ea01 100644
--- a/tools/teerex/_tags
+++ b/tools/teerex/_tags
@@ -6,6 +6,6 @@
 
 <*.{ml,mli,byte,native}>: use_str, use_libbase, use_compilerlib, use_graph, use_libtrx, use_ocamllang, use_zip, use_buildinfos, use_passlib
 
-<trx_ocaml.{byte,native}>: thread, use_unix
+<trx_ocaml.{byte,native}>: thread
 <trx_ocaml_main.{byte,native}>: thread, use_unix
-<trx_interpreter.{byte,native}>: thread, use_unix
+<trx_interpreter.{byte,native}>: thread