Add respect to LIB_DIR variable and pkgconfig example

Makefile

@@ -7,7 +7,8 @@
 # Project directories
 SRC_DIR ?= src
 SDK_DIR ?= sdk
-OUT_DIR ?= ./build
+OUT_DIR ?= build
+LIB_DIR ?= lib
 
 # Project definition
 include project.mk
@@ -77,7 +78,7 @@ default: library
 .PHONY:  all dirs clean doc install
 
 install: library
-	cp $(OUT_DIR)/lib$(PROJECT_NAME).so $(PREFIX)/lib64/
+	cp $(OUT_DIR)/lib$(PROJECT_NAME).so $(PREFIX)/$(LIB_DIR)/
 	cp -R include/aisl $(PREFIX)/include/
 
 # vim:ft=make

libaisl.pc.example

@@ -0,0 +1,19 @@
+###############################################################################
+#
+#                 Copyright (c) 2017-2019 by Löwenware Ltd
+#              Please, refer LICENSE file for legal information
+#
+###############################################################################
+
+prefix=/usr/local
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: libaisl
+URL: https://lowenware.com/aisl/
+Description: Asynchronous Internet Server Library
+Version: 1.0.0
+Libs: -L${libdir} -laisl
+Libs.private: -lcrypto -lssl
+Cflags: -I${includedir} 

project.mk

@@ -3,8 +3,8 @@
 # Löwenware Makefile Config, 2019-03-02 17:35
 #
 
-PREFIX = /usr/local
-PKG_CONFIG = pkg-config
+PREFIX ?= /usr/local
+PKG_CONFIG ?= pkg-config
 
 PROJECT_NAME = aisl