diff --git a/i/Inspector/Inspector-2019_update4.eb b/i/Inspector/Inspector-2019_update4.eb
index 3bf0f7a2..a10fbc3b 100644
--- a/i/Inspector/Inspector-2019_update4.eb
+++ b/i/Inspector/Inspector-2019_update4.eb
@@ -13,6 +13,10 @@ sources = ['inspector_%(version)s.tar.gz']
 
 dontcreateinstalldir = 'True'
 
+dependencies = [
+   ('X11', '20190311'),
+]
+
 license_file = '/apps/licenses/intel/license.lic'
 
 moduleclass = 'tools'
diff --git a/p/protobuf-python/protobuf-python-3.9.0-GCC-6.3.0-2.27-Python-3.7.3.eb b/p/protobuf-python/protobuf-python-3.9.0-GCC-6.3.0-2.27-Python-3.7.3.eb
new file mode 100644
index 00000000..2a54948f
--- /dev/null
+++ b/p/protobuf-python/protobuf-python-3.9.0-GCC-6.3.0-2.27-Python-3.7.3.eb
@@ -0,0 +1,35 @@
+# IT4Innovations 2019
+
+easyblock = 'PythonPackage'
+
+name = 'protobuf-python'
+version = '3.9.0'
+versionsuffix= '-Python-3.7.3'
+
+homepage = 'https://github.com/google/protobuf/'
+description = """Python Protocol Buffers runtime library."""
+
+toolchain = {'name': 'GCCcore', 'version': '6.3.0'}
+
+source_urls = ['https://github.com/google/protobuf/archive/v%(version)s']
+sources = [SOURCE_TAR_GZ]
+
+dependencies = [
+    ('protobuf', version),
+    ('Python', '3.7.3')
+]
+
+# use_setup_py_develop = True
+
+start_dir = 'python'
+
+installopts = '--cpp_implementation'
+
+sanity_check_paths = {
+    'files': [],
+    'dirs': ['lib/python3.7/site-packages'],
+}
+
+options = {'modulename': 'google.protobuf'}
+
+moduleclass = 'devel'
diff --git a/p/protobuf/protobuf-3.9.0-GCC-6.3.0-2.27.eb b/p/protobuf/protobuf-3.9.0-GCC-6.3.0-2.27.eb
new file mode 100644
index 00000000..1c1452a8
--- /dev/null
+++ b/p/protobuf/protobuf-3.9.0-GCC-6.3.0-2.27.eb
@@ -0,0 +1,40 @@
+# IT4Innovations 2019
+
+easyblock = 'CMakeMake'
+
+name = 'protobuf'
+version = '3.9.0'
+
+homepage = 'https://code.google.com/p/protobuf/'
+description = """Google Protocol Buffers"""
+
+toolchain = {'name': 'GCCcore', 'version': '6.3.0'}
+
+sources = ['%(name)s-python-%(version)s.tar.gz']
+source_urls = ['https://github.com/google/protobuf/releases/download/v%(version)s/']
+
+# after instalation: python3 setup.py install --cpp_implementation
+
+builddependencies = [
+    ('binutils', '2.27'),
+    ('CMake', '3.14.1', '', True),
+]
+
+srcdir = 'cmake'
+
+configopts = '-Dprotobuf_BUILD_TESTS=OFF -Dprotobuf_BUILD_SHARED_LIBS=ON '
+
+postinstallcmds = [
+    'cp %(builddir)s/%(name)s-%(version)s/  %(installdir)s/build -R',
+]
+
+sanity_check_paths = {
+    'files': ['bin/protoc'],
+    'dirs': [],
+}
+
+modextravars = {
+    'PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION': 'cpp',
+}
+
+moduleclass = 'devel'
diff --git a/v/VTune/VTune-2019_update4.eb b/v/VTune/VTune-2019_update4.eb
index a73d0524..11ec835e 100644
--- a/v/VTune/VTune-2019_update4.eb
+++ b/v/VTune/VTune-2019_update4.eb
@@ -18,6 +18,10 @@ license_file = '/apps/licenses/intel/license.lic'
 
 #preinstallopts = 'sed "1,2d" silent.cfg -i && '
 
+dependencies = [
+   ('X11', '20190311'),
+]
+
 sanity_check_paths = {
     'files': [],
     'dirs': ['vtune_amplifier_2019.4.0.597835'],