diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e3f18c..aef7498 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required (VERSION 3.10)
-project(webfuse VERSION 0.3.0 DESCRIPTION "Websocket filesystem based on libfuse")
+project(webfuse VERSION 0.4.0 DESCRIPTION "Websocket filesystem based on libfuse")
 
 option(WITHOUT_TESTS    "disable unit tests"   OFF)
 option(WITHOUT_ADAPTER  "disable adapter library" OFF)
diff --git a/Doxyfile b/Doxyfile
index 4f4ccdf..adf69af 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -5,7 +5,7 @@
 #---------------------------------------------------------------------------
 DOXYFILE_ENCODING      = UTF-8
 PROJECT_NAME           = "webfuse"
-PROJECT_NUMBER         = 0.3.0
+PROJECT_NUMBER         = 0.4.0
 PROJECT_BRIEF          = "Websocket filesystem based on libfuse"
 PROJECT_LOGO           =
 OUTPUT_DIRECTORY       = "doc/api"
diff --git a/VERSION b/VERSION
index 0d91a54..1d0ba9e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.0
+0.4.0
diff --git a/changelog.md b/changelog.md
new file mode 100644
index 0000000..cc9a9dd
--- /dev/null
+++ b/changelog.md
@@ -0,0 +1,38 @@
+# webfuse changelog
+
+## 0.4.0 _(unknown)_
+
+### Fixes
+
+*   Fix meson build failure when gtest or jansson are not installed
+*   Fix crash if libfuse is not available at runtime
+
+## 0.3.0 _(Fri Jun 05 2020)_
+
+### Breaking Changes
+
+*   Remove argument `timeout_ms` in  `wf_server_service` and `wfp_client_service`
+*   Remove `wfp_client_ontimer`
+
+### New Features
+
+*   Add meson build support
+*   Add `wf_server_interrupt` and `wfp_client_interrupt`
+
+## 0.2.0 _(Sun Mar 01 2020)_
+
+### New Features
+
+*   Add authentication support of provider
+*   Add API documentation (doxygen)
+*   Add `mountpoint_factory`
+*   Add option to build adapter and provider libraries separately
+
+### Fixes
+
+*   Fix crash of example when using option `-h`
+*   Fix error in `static_filesystem` providen when adding multiple files to same directory
+
+## 0.1.0 _(Sat Apr 27 2019)_
+
+*   initial version
diff --git a/doc/build.md b/doc/build.md
index 3aa6bec..a100114 100644
--- a/doc/build.md
+++ b/doc/build.md
@@ -22,18 +22,35 @@ in order to reduce build dependencies.
 -   **WITHOUT_ADAPTER**: omit adapter library  
     `cmake -DWITHOUT_ADAPTER=ON`
 
--   **WIHTOU_PROVIDER**: omit provider library
+-   **WIHTOUT_PROVIDER**: omit provider library
     `cmake -DWITHOUT_PROVIDER=ON`
 
 ## Build using Meson (experimental)
 
 _Note: Meson build support is experimental. Do not rely on it._
 
-  meson .build
-  cd .build
-  ninja build
+    meson .build
+    cd .build
+    ninja build
+
+### Meson Build options
+
+Build options can be specified during meson setup or later via meson configure.
+
+    meson -D<option>=<value> .build
+
+The following options are available:
+
+-   **without_tests**: _(boolean)_ diable tests  
+    `meson -Dwithout_tests=true .build`
+
+-   **without_adapter**: _(boolean)_ omit adapter library  
+    `meson -Dwithout_adapter=true .build`
+
+-   **without_provider**: _(boolean)_ omit provider library
+    `meson -Dwithout_provider=true .build`
 
-_Note: Build options are not supported yet._
+_Note that unit tests are only available, when both libraries are built._
 
 ## Create API documentation
 
diff --git a/lib/webfuse/adapter/impl/session.c b/lib/webfuse/adapter/impl/session.c
index 6bacd10..159f43a 100644
--- a/lib/webfuse/adapter/impl/session.c
+++ b/lib/webfuse/adapter/impl/session.c
@@ -109,8 +109,11 @@ bool wf_impl_session_add_filesystem(
     if (result)
     {
         struct wf_impl_filesystem * filesystem = wf_impl_filesystem_create(session, name, mountpoint);
-        wf_slist_append(&session->filesystems, &filesystem->item);
         result = (NULL != filesystem);
+        if (result)
+        {
+            wf_slist_append(&session->filesystems, &filesystem->item);
+        }
     }
     
     // cleanup on error
diff --git a/meson.build b/meson.build
index f2b8c01..e08f828 100644
--- a/meson.build
+++ b/meson.build
@@ -1,10 +1,17 @@
-project('webfuse', 'c', 'cpp', version: '0.3.0', license: 'LGPL-3.0+')
+project('webfuse', 'c', 'cpp', version: '0.4.0', license: 'LGPL-3.0+')
+
+without_adapter = get_option('without_adapter')
+without_provider = get_option('without_provider')
+without_tests = get_option('without_tests') or without_adapter or without_provider
+
+libwebsockets_dep = dependency('libwebsockets', version: '>=4.0.13', required: false)
+if not libwebsockets_dep.found()
+	cmake = import('cmake')
+	libwebsockets = cmake.subproject('libwebsockets')
+	libwebsockets_dep = libwebsockets.dependency('websockets_shared')
+endif
 
-libwebsockets_dep = dependency('libwebsockets', version: '>=4.0.1') 
 jansson_dep = dependency('jansson', version: '>=2.11', fallback: ['jansson', 'jansson_dep'])
-libfuse_dep = dependency('fuse3', version: '>=3.8.0', fallback: ['fuse3', 'libfuse_dep'])
-gtest_dep = dependency('gtest', version: '>=1.10.0', fallback: ['gtest', 'gtest_dep']) 
-gmock_main_dep = dependency('gmock_main', version: '>=1.10.0', fallback: ['gtest', 'gmock_main_main_dep'])
 
 pkg_config = import('pkgconfig')
 
@@ -45,6 +52,8 @@ install_subdir('include/webfuse/core', install_dir: 'include/webfuse')
 
 # Webfuse provider
 
+if not without_provider
+
 webfuse_provider_static = static_library('webfuse_provider',
 	'lib/webfuse/provider/api.c',
 	'lib/webfuse/provider/impl/url.c',
@@ -67,7 +76,8 @@ webfuse_provider_static = static_library('webfuse_provider',
 
 webfuse_provider_static_dep = declare_dependency(
     include_directories: inc_dir,
-    link_with: webfuse_provider_static)
+    link_with: webfuse_provider_static,
+	dependencies: [webfuse_core_dep])
 
 webfuse_provider = shared_library('webfuse_provider',
     'lib/webfuse/provider/api.c',
@@ -86,15 +96,22 @@ install_headers('include/webfuse_provider.h', subdir: 'webfuse')
 install_subdir('include/webfuse/provider', install_dir: 'include/webfuse')
 
 pkg_config.generate(
-    libraries: [webfuse_provider, jansson_dep, libwebsockets_dep],
+    libraries: [webfuse_provider],
+	requires: ['libwebsockets', 'jansson'],
     subdirs: '.',
     version: meson.project_version(),
     name: 'libwebfuse_provider',
     filebase: 'webfuse_provider',
     description: 'Provider library for websockets filesystem')
 
+endif
+
 #  Webfuse adapter
 
+if not without_adapter
+
+libfuse_dep = dependency('fuse3', version: '>=3.8.0', fallback: ['fuse3', 'libfuse_dep'])
+
 webfuse_adapter_static = static_library('webfuse_adapter',
 	'lib/webfuse/adapter/api.c',
 	'lib/webfuse/adapter/impl/filesystem.c',
@@ -122,7 +139,7 @@ webfuse_adapter_static = static_library('webfuse_adapter',
 webfuse_adapter_static_dep = declare_dependency(
 	include_directories: inc_dir,
 	link_with: [webfuse_adapter_static],
-	dependencies: [libfuse_dep])
+	dependencies: [webfuse_core_dep, libfuse_dep])
 
 webfuse_adapter = shared_library('webfuse_adapter',
     'lib/webfuse/adapter/api.c',
@@ -141,15 +158,23 @@ install_headers('include/webfuse_adapter.h', subdir: 'webfuse')
 install_subdir('include/webfuse/adapter', install_dir: 'include/webfuse')
 
 pkg_config.generate(
-    libraries: [webfuse_adapter, jansson_dep, libwebsockets_dep, libfuse_dep],
+    libraries: [webfuse_adapter],
+	requires: ['fuse3', 'libwebsockets', 'jansson'],
     subdirs: '.',
     version: meson.project_version(),
     name: 'libwebfuse_adapter',
     filebase: 'webfuse_adapter',
     description: 'Websockets filesystem server library')
 
+endif
+
 # Unit Tests
 
+if not without_tests
+
+gtest_dep = dependency('gtest', version: '>=1.10.0', fallback: ['gtest', 'gtest_dep']) 
+gmock_main_dep = dependency('gmock_main', version: '>=1.10.0', fallback: ['gtest', 'gmock_main_dep'])
+
 fscheck = executable('fs_check',
 	'test/webfuse/tests/integration/fs_check.c')
 
@@ -258,3 +283,5 @@ alltests = executable('alltests',
 	])
 
 test('alltests', alltests)
+
+endif
\ No newline at end of file
diff --git a/meson_options.txt b/meson_options.txt
new file mode 100644
index 0000000..81622ad
--- /dev/null
+++ b/meson_options.txt
@@ -0,0 +1,3 @@
+option('without_tests', type: 'boolean', value: false, description: 'disable unit tests')
+option('without_adapter', type: 'boolean', value: false, description: 'disable adapter library')
+option('without_provider', type: 'boolean', value: false, description: 'disable provider library')
\ No newline at end of file
diff --git a/subprojects/libwebsockets.wrap b/subprojects/libwebsockets.wrap
new file mode 100644
index 0000000..da72f53
--- /dev/null
+++ b/subprojects/libwebsockets.wrap
@@ -0,0 +1,6 @@
+[wrap-file]
+directory = libwebsockets-4.0.13
+
+source_url = https://github.com/warmcat/libwebsockets/archive/v4.0.13.zip
+source_filename = v4.0.13.zip
+source_hash = 0914ea3fdec496daf6b6a5c00f7ba1b52eb8cc3d55b66685df92920b232fd7a5
diff --git a/test/webfuse/tests/integration/provider.cc b/test/webfuse/tests/integration/provider.cc
index e813b4d..a4b4473 100644
--- a/test/webfuse/tests/integration/provider.cc
+++ b/test/webfuse/tests/integration/provider.cc
@@ -9,6 +9,39 @@
 
 using namespace std::chrono_literals;
 
+namespace
+{
+    enum class ConnectionState
+    {
+        disconnected,
+        connected,
+        connecting
+    };
+}
+
+extern "C"
+{
+
+void
+webfuse_test_provider_onconnected(
+    void * user_data)
+{
+    auto * fs = reinterpret_cast<wfp_static_filesystem*>(user_data);
+    auto * connection_state = reinterpret_cast<ConnectionState*>(wfp_static_filesystem_get_user_data(fs));
+    *connection_state = ConnectionState::connected;
+}
+
+void
+webfuse_test_provider_ondisconnected(
+    void * user_data)
+{
+    auto * fs = reinterpret_cast<wfp_static_filesystem*>(user_data);
+    auto * connection_state = reinterpret_cast<ConnectionState*>(wfp_static_filesystem_get_user_data(fs));
+    *connection_state = ConnectionState::disconnected;
+}
+
+}
+
 namespace webfuse_test
 {
 
@@ -18,23 +51,40 @@ public:
     explicit Private(char const * url)
     : is_shutdown_requested(false)
     {
+        ConnectionState connection_state = ConnectionState::connecting;
+
         config = wfp_client_config_create();
         wfp_client_config_set_certpath(config, "client-cert.pem");
         wfp_client_config_set_keypath(config, "client-key.pem");
         wfp_client_config_set_ca_filepath(config, "server-cert.pem");
+        wfp_client_config_set_onconnected(config, &webfuse_test_provider_onconnected);
+        wfp_client_config_set_ondisconnected(config, &webfuse_test_provider_ondisconnected);
 
         fs = wfp_static_filesystem_create(config);
+        wfp_static_filesystem_set_user_data(fs, reinterpret_cast<void*>(&connection_state));
         wfp_static_filesystem_add_text(fs, "hello.txt", 0444, "Hello, World");
 
         client = wfp_client_create(config);
         wfp_client_connect(client, url);
-        while (!wfp_impl_client_is_connected(client))
+        while (ConnectionState::connecting == connection_state)
         {
             wfp_client_service(client);
         }
-       
-        thread = std::thread(Run, this);
-        std::this_thread::sleep_for(200ms);
+
+        if (ConnectionState::connected == connection_state)
+        {
+            thread = std::thread(Run, this);
+            std::this_thread::sleep_for(200ms);
+        }
+        else
+        {
+            wfp_client_dispose(client);
+
+            wfp_static_filesystem_dispose(fs);
+            wfp_client_config_dispose(config);
+
+            throw std::runtime_error("unable to connect");
+        }
     }
 
     ~Private()
diff --git a/test/webfuse/utils/static_filesystem.c b/test/webfuse/utils/static_filesystem.c
index 855564b..0f64733 100644
--- a/test/webfuse/utils/static_filesystem.c
+++ b/test/webfuse/utils/static_filesystem.c
@@ -38,6 +38,7 @@ struct wfp_static_filesystem
     struct wfp_static_filesystem_entry * entries;
     size_t size;
     size_t capacity;
+    void * user_data;
 };
 
 static struct wfp_static_filesystem_entry *
@@ -335,6 +336,7 @@ wfp_static_filesystem_create(
     filesystem->entries = malloc(sizeof(struct wfp_static_filesystem_entry) * WFP_STATIC_FILESYSTEM_DEFAULT_CAPACITY);
     filesystem->size = 0;
     filesystem->capacity = WFP_STATIC_FILESYSTEM_DEFAULT_CAPACITY;
+    filesystem->user_data = NULL;
 
     wfp_static_filesystem_add_dir(filesystem, 0, "<root>");
 
@@ -402,3 +404,18 @@ wfp_static_filesystem_add_text(
     size_t length = strlen(content);
     wfp_static_filesystem_add(filesystem, path, mode, content, length);
 }
+
+void
+wfp_static_filesystem_set_user_data(
+    struct wfp_static_filesystem * filesystem,
+    void * user_data)
+{
+    filesystem->user_data = user_data;
+}
+
+void *
+wfp_static_filesystem_get_user_data(
+    struct wfp_static_filesystem * filesystem)
+{
+    return filesystem->user_data;
+}
diff --git a/test/webfuse/utils/static_filesystem.h b/test/webfuse/utils/static_filesystem.h
index bf23b88..d4d574a 100644
--- a/test/webfuse/utils/static_filesystem.h
+++ b/test/webfuse/utils/static_filesystem.h
@@ -56,6 +56,15 @@ wfp_static_filesystem_add_text(
     int mode,
     char const * content);
 
+extern void
+wfp_static_filesystem_set_user_data(
+    struct wfp_static_filesystem * filesystem,
+    void * user_data);
+
+extern void *
+wfp_static_filesystem_get_user_data(
+    struct wfp_static_filesystem * filesystem);
+
 #ifdef __cplusplus
 }
 #endif