diff --git a/GPService/gpservice.cpp b/GPService/gpservice.cpp
index 2d6f214..41e66e0 100644
--- a/GPService/gpservice.cpp
+++ b/GPService/gpservice.cpp
@@ -40,7 +40,7 @@ QString GPService::findBinary()
 }
 
 /* Port from https://github.com/qt/qtbase/blob/11d1dcc6e263c5059f34b44d531c9ccdf7c0b1d6/src/corelib/io/qprocess.cpp#L2115 */
-QStringList GPService::splitCommand(QStringView command)
+QStringList GPService::splitCommand(QString command)
 {
     QStringList args;
     QString tmp;
@@ -114,6 +114,7 @@ void GPService::connect(QString server, QString username, QString passwd, QStrin
     QStringList args;
     args << QCoreApplication::arguments().mid(1)
      << "--protocol=gp"
+     << "-s" << qgetenv("VPNC_SCRIPT")
      << splitCommand(extraArgs)
      << "-u" << username
      << "-C" << passwd
diff --git a/GPService/gpservice.h b/GPService/gpservice.h
index 8e75eac..7f547a3 100644
--- a/GPService/gpservice.h
+++ b/GPService/gpservice.h
@@ -3,7 +3,6 @@
 
 #include <QObject>
 #include <QProcess>
-#include <QStringView>
 
 static const QString binaryPaths[] {
     "/usr/local/bin/openconnect",
@@ -55,7 +54,7 @@ private:
 
     void log(QString msg);
     static QString findBinary();
-    static QStringList splitCommand(QStringView command);
+    static QStringList splitCommand(QString command);
 };
 
 #endif // GLOBALPROTECTSERVICE_H
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index c48c23a..6b4b3eb 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -8,11 +8,9 @@ description: |
 grade: devel
 confinement: devmode # use 'strict' once you have the right plugs and slots
 
-package-repositories:
-  - type: apt
-    ppa: beineri/opt-qt-5.12.10-bionic
-  - type: apt
-    ppa: dominik-stadler/dsta-bionic-ppa
+layout:
+  /usr/share/qt5:
+    bind: $SNAP/usr/share/qt5
 
 slots:
   gpservice-slot:
@@ -32,17 +30,21 @@ apps:
     command: usr/bin/gpservice
     environment:
       LANG: en_US.utf8
+      VPNC_SCRIPT: $SNAP/usr/share/vpnc-scripts/vpnc-script
     plugs:
       - network
-    # slots: 
-    #   - gpservice-slot
+    slots: 
+      - gpservice-slot
 
   gpclient:
-    common-id: com.yuezk.qt.gpclient.desktop
+    common-id: com.yuezk.qt.gpclient
     command: usr/bin/gpclient
+    extensions:
+      - kde-neon
     desktop: usr/share/applications/com.yuezk.qt.gpclient.desktop
     environment:
-      QT_PLUGIN_PATH: $SNAP/opt/qt512/plugins
+      # QT_PLUGIN_PATH: $SNAP/opt/qt512/plugins
+      QT_PLUGIN_PATH: $SNAP/usr/lib/x86_64-linux-gnu/qt5/plugins
     plugs:
       - desktop
       - desktop-legacy
@@ -53,32 +55,162 @@ apps:
       - gpservice-plug
 
 parts:
-  application:
-    plugin: nil
-    source: .
+  gmplib:
+    plugin: autotools
+    source: https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz
 
+  nettle:
+    plugin: autotools
+    source: https://ftp.gnu.org/gnu/nettle/nettle-3.7.3.tar.gz
+    configflags:
+      - --disable-openssl
+      - --disable-documentation
+    after:
+      - gmplib
+
+  tpm2-tss:
+    plugin: autotools
+    source: https://github.com/tpm2-software/tpm2-tss.git
+    source-depth: 1
+    source-tag: 3.1.0
     build-packages:
-      - g++
-      - make
-      - libgl1-mesa-dev
-      - qt512base
-      - qt512websockets
-      - qt512webengine
-
+      - autoconf-archive
+      - libcmocka-dev
+      - build-essential
+      - pkg-config
+      - libtool
+      - automake
+      - libssl-dev
+      - autoconf
+      - libjson-c-dev
+      - libini-config-dev
+      - libcurl4-openssl-dev
+      - acl
     stage-packages:
-      - qt512base
-      - qt512websockets
-      - qt512webengine
+      - libasn1-8-heimdal
+      - libcurl4
+      - libgssapi3-heimdal
+      - libhcrypto4-heimdal
+      - libheimbase1-heimdal
+      - libheimntlm0-heimdal
+      - libhx509-5-heimdal
+      - libkrb5-26-heimdal
+      - libldap-2.4-2
+      - libnghttp2-14
+      - libpsl5
+      - libroken18-heimdal
+      - librtmp1
+      - libsasl2-2
+      - libwind0-heimdal
+    configflags:
+      - --disable-doxygen-doc
 
-    override-build: |
-      QT_BASE_DIR=/opt/qt512
+  gnutls:
+    plugin: autotools
+    source: http://mirrors.dotsrc.org/gcrypt/gnutls/v3.7/gnutls-3.7.2.tar.xz
+    build-packages:
+      - wget
+      - build-essential
+      - autoconf
+      - libtool
+      - gettext
+      - autopoint
+      - automake
+      - autogen
+      - libp11-kit-dev
+      - libtspi-dev
+      - libunistring-dev
+      - guile-2.2-dev
+      - libtasn1-6-dev
+      - libidn2-0-dev
+      - gperf
+      - libunbound-dev
+      - bison
+    stage-packages:
+      - guile-2.2-libs
+      - libgc1c2
+      - libltdl7
+      - libopts25
+      - libunbound2
+    configflags:
+      - --disable-doc
+      - --disable-full-test-suite
+    after:
+      - gmplib
+      - nettle
+  
+  libpskc:
+    plugin: autotools
+    source: https://download.savannah.nongnu.org/releases/oath-toolkit/oath-toolkit-2.6.7.tar.gz
+    source-subdir: libpskc
+    build-packages:
+      - build-essential
+      - autoconf
+      - automake
+      - libtool
+      - bison
+      - gengetopt
+      - libxmlsec1-dev
+      - libxml2-utils
 
-      export QTDIR=$QT_BASE_DIR
-      export PATH=$QT_BASE_DIR/bin:$PATH
-      export LD_LIBRARY_PATH=$QT_BASE_DIR/lib/x86_64-linux-gnu:$QT_BASE_DIR/lib:$LD_LIBRARY_PATH
-      export PKG_CONFIG_PATH=$QT_BASE_DIR/lib/pkgconfig:$PKG_CONFIG_PATH
+  openconnect:
+    plugin: autotools
+    source: https://github.com/openconnect/openconnect.git
+    source-depth: 1
+    source-tag: v8.10
+    build-packages:
+      - build-essential
+      - gettext
+      - autoconf
+      - automake
+      - libtool
+      - libxml2-dev
+      - zlib1g-dev
+      - pkg-config
+      - libp11-kit-dev
+      - libproxy-dev
+      - trousers
+      - libtasn1-6-dev
+      - libstoken-dev
+      - libpcsclite-dev
+      - vpnc-scripts
+    stage-packages:
+      - vpnc-scripts
+      - libp11-kit0
+      - libproxy1v5
+      - libstoken1
+      - libpcsclite1
+      - libxml2
+      - zlib1g
+    after:
+      - gnutls
+      - tpm2-tss
+      - libpskc
+  
+  application:
+    plugin: qmake
+    build-attributes:
+      - keep-execstack
+    source: .
+    build-packages:
+      - qt5-default
+      - qtwebengine5-dev
+      - libqt5websockets5-dev
+    stage-packages:
+      - libqt5printsupport5
+      - libqt5gui5
+      - libqt5network5
+      - libqt5svg5
+      - libqt5webengine5
+      - libqt5websockets5
+      - libqt5quickwidgets5
+      - libqt5webenginewidgets5
+      - libqt5dbus5
+      - libatm1
+      - libtspi1
+      - libxmlsec1
+      - libxmlsec1-openssl
+    options:
+      - CONFIG+=release
 
-      qmake CONFIG+=release
-      make
-      make install INSTALL_ROOT="${SNAPCRAFT_PART_INSTALL}"