Makefile structure similar to engine, recursively specializing local.conf with defaults in Makefile.conf

Makefile

@@ -1,3 +1,24 @@
+# Copyright 2017, pEp Foundation
+# This file is part of pEp JNI Adapter
+# This file may be used under the terms of the GNU General Public License version 3
+# see LICENSE.txt
+
+HERE_REL := $(notdir $(CURDIR))
+
+include Makefile.conf
+
+ifneq ($(wildcard local.conf),)
+    $(info ================================================)
+    $(info Overrides in `local.conf` are used.)
+    $(info ================================================)
+endif
+
+ifdef BUILD_CONFIG
+    $(info ================================================)
+    $(info Overrides in `$(BUILD_CONFIG)` are used.)
+    $(info ================================================)
+endif
+
 .PHONY: all src test clean
 
 all: src test

README.md

@@ -26,9 +26,13 @@ sudo port install openjdk11
 ~~~
 
 ## Building
-Customization of the build can be done in `src/Makefile.conf`, or in a file `src/local.conf` which is not part of the source code distribution.
 
-An example `src/local.conf` looks like this:
+Build configuration will be the result of including these files in the following order:
+* `Makefile.conf` - Defaults
+* `local.conf` - optional cfg (overwrites existing values)
+* `src/local.conf`- optional cfg for src dir (overwrites existing values)
+
+An example `local.conf` looks like this:
 
 ~~~
 JAVA_HOME=/Library/Java/JavaVirtualMachines/openjdk8/Contents/Home
@@ -49,15 +53,13 @@ Now, build the Adapter with
 On Linux:
 
 ~~~
-cd src
-make
+make src
 ~~~
 
 On macOS:
 
 ~~~
-cd src
-gmake
+make src
 ~~~
 
-(The GNU Make distributed with macOS is too old, install GNU Make "gmake" from macPorts).
+(The GNU Make distributed with macOS might be too old, in this case install GNU Make "gmake" from macPorts).

src/Makefile

@@ -3,19 +3,7 @@
 # This file may be used under the terms of the GNU General Public License version 3
 # see LICENSE.txt
 
-include Makefile.conf
-
-ifneq ($(wildcard local.conf),)
-    $(info ================================================)
-    $(info Overrides in `local.conf` are used.)
-    $(info ================================================)
-endif
-
-ifdef BUILD_CONFIG
-    $(info ================================================)
-    $(info Overrides in `$(BUILD_CONFIG)` are used.)
-    $(info ================================================)
-endif
+include ../Makefile.conf
 
 ifndef JAVA_HOME
     $(error JAVA_HOME is not set!)
@@ -37,7 +25,7 @@ ifeq ($(BUILD_FOR),Linux)
 else ifeq ($(BUILD_FOR),Darwin)
     SHARED=libpEpJNI.dylib
 else
-    $(error I don't know how to build for $(BUILD_FOR).)
+    $(error I dont know how to build for $(BUILD_FOR).)
 endif
 
 JAVA_SOURCES=foundation/pEp/jniadapter/AbstractEngine.java \