diff --git a/Makefile b/Makefile
new file mode 100644
index 00000000000..84d916e9a3f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+# NOTE: please keep your version of sass up to date: sudo gem update
+.PHONY: watch css
+SASS_FILES=$(wildcard addons/*/static/src/css/*.sass openerp/addons/*/static/src/css/*.sass)
+CSS_FILES=$(patsubst %.sass,%.css,${SASS_FILES})
+css: ${CSS_FILES}
+%.css: %.sass
+	sass -t expanded --compass --unix-newlines --sourcemap=none $< $@
+watch:
+	sass -t expanded --compass --unix-newlines --sourcemap=none --watch .:.
diff --git a/addons/account_analytic_analysis/static/src/css/Makefile b/addons/account_analytic_analysis/static/src/css/Makefile
deleted file mode 100644
index 21462c06dcc..00000000000
--- a/addons/account_analytic_analysis/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-analytic.css: analytic.sass
-	sass -t expanded analytic.sass analytic.css
-
diff --git a/addons/board/static/src/css/Makefile b/addons/board/static/src/css/Makefile
deleted file mode 100644
index 0cb5ae70f4a..00000000000
--- a/addons/board/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-dashboard.css: dashboard.sass
-	sass --trace -t expanded dashboard.sass dashboard.css
-
diff --git a/addons/hr_timesheet_sheet/static/src/css/Makefile b/addons/hr_timesheet_sheet/static/src/css/Makefile
deleted file mode 100644
index e60087d9b33..00000000000
--- a/addons/hr_timesheet_sheet/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-timesheet.css: timesheet.sass
-	sass -t expanded timesheet.sass timesheet.css
-
diff --git a/addons/lunch/static/src/css/Makefile b/addons/lunch/static/src/css/Makefile
deleted file mode 100644
index 941e8dbfe7d..00000000000
--- a/addons/lunch/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-lunch.css: lunch.sass
-	sass -t expanded lunch.sass lunch.css
-
diff --git a/addons/note/static/src/css/Makefile b/addons/note/static/src/css/Makefile
deleted file mode 100644
index 17bf009479e..00000000000
--- a/addons/note/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-note.css: note.sass
-	sass --trace -t expanded note.sass note.css
-
diff --git a/addons/web/static/src/css/Makefile b/addons/web/static/src/css/Makefile
deleted file mode 100644
index d6b4f4b2fc8..00000000000
--- a/addons/web/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-base.css: base.sass
-	sass --trace -t expanded base.sass base.css
-
diff --git a/addons/web_kanban/static/src/css/Makefile b/addons/web_kanban/static/src/css/Makefile
deleted file mode 100644
index cae8f74448f..00000000000
--- a/addons/web_kanban/static/src/css/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-kanban.css: kanban.sass
-	sass -t expanded kanban.sass kanban.css
-