Fixes all the little issues with that new version. This is some kind of
joke, isn't it? Did they even test the stuff? Ah well...
---
diff -urpN a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt	2019-03-11 22:52:18.000000000 +0100
+++ b/CMakeLists.txt	2019-05-12 18:03:25.279901510 +0200
@@ -21,11 +21,11 @@
 # https://cmake.org/cmake/help/v3.12/module/CMakeDependentOption.html?highlight=cmakedependentoption
 # cmake 3.12 have more better modern c++ support
 
-cmake_minimum_required(VERSION 3.12  FATAL_ERROR)
-project(nana VERSION      1.6.2
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
+project(nana VERSION 1.7.1
         DESCRIPTION "C++ GUI library"
         HOMEPAGE_URL http://nanapro.org
-        LANGUAGES CXX         )
+        LANGUAGES CXX)
 
 #######################     Main setting of Nana targets, sources and installs    #####################
 
diff -urpN a/build/cmake/compilers.cmake b/build/cmake/compilers.cmake
--- a/build/cmake/compilers.cmake	2019-03-11 22:52:18.000000000 +0100
+++ b/build/cmake/compilers.cmake	2019-05-12 18:04:11.045296059 +0200
@@ -14,8 +14,8 @@
 
 if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") #  AND NOT MINGW??
 
-    target_compile_options(nana PRIVATE  -Wall
-                                 PUBLIC  -g   )
+    target_compile_options(nana PRIVATE -Wall
+                                 PUBLIC -Os -s)
 
     set(THREADS_PREFER_PTHREAD_FLAG ON)               #  todo - test this
     find_package(Threads REQUIRED)
diff -urpN a/build/cmake/enable_audio.cmake b/build/cmake/enable_audio.cmake
--- a/build/cmake/enable_audio.cmake	2019-03-11 22:52:18.000000000 +0100
+++ b/build/cmake/enable_audio.cmake	2019-05-16 07:08:35.652372215 +0200
@@ -4,12 +4,12 @@ option(NANA_CMAKE_ENABLE_AUDIO "Enable c
 if(NANA_CMAKE_ENABLE_AUDIO)
     target_compile_definitions(nana PUBLIC NANA_ENABLE_AUDIO)
     if(UNIX)
-        find_package(ASOUND) # ? https://github.com/hintjens/demidi/blob/master/Findasound.cmake
-        if(ASOUND_FOUND)
-            target_include_directories(nana PUBLIC ${ASOUND_INCLUDE_DIRS})
-            target_link_libraries(nana PUBLIC  ${ASOUND_LIBRARIES})
+        find_package(ALSA)
+        if(ALSA_FOUND)
+            target_include_directories(nana PUBLIC ${ALSA_INCLUDE_DIRS})
+            target_link_libraries(nana PUBLIC  ${ALAS_LIBRARIES})
         else()
             message(FATAL_ERROR "libasound is not found")
         endif()
     endif()
-endif()
\ No newline at end of file
+endif()
diff -urpN a/source/filesystem/filesystem.cpp b/source/filesystem/filesystem.cpp
--- a/source/filesystem/filesystem.cpp	2019-04-22 05:06:30.000000000 +0200
+++ b/source/filesystem/filesystem.cpp	2019-05-16 07:10:08.609800194 +0200
@@ -40,9 +40,9 @@
 	#include <dirent.h>
 	#include <cstdio>
 	#include <cstring>
-	#include <errno.h>
+	#include <cerrno>
 	#include <unistd.h>
-	#include <stdlib.h>
+	#include <cstdlib>
 #endif
 
 namespace fs = std::filesystem;
@@ -1141,7 +1141,7 @@ namespace nana {	namespace experimental
 			struct tm t;
 			nana::filesystem_ext::modified_file_time(p, t);
 			std::chrono::system_clock::time_point dateTime =std::chrono::system_clock::from_time_t( mktime(&t) );
-			return 	dateTime;
+			return dateTime;
 		}
 
 			bool create_directory(const path& p)