diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 28abda57d..25dbc6161 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -129,7 +129,7 @@ crosscompile:
       - binaries/*
 
 
-c++17:
+c++20:
   image: opensuse/tumbleweed
   stage: build
   tags:
@@ -138,7 +138,7 @@ c++17:
     - pwd
   script:
     - zypper -n dup
-    - zypper -n install cmake git gcc-c++ boost-devel libboost_atomic-devel libboost_filesystem-devel libboost_system-devel libboost_date_time-devel libboost_thread-devel libboost_regex-devel libboost_serialization-devel libboost_program_options-devel libboost_math-devel libboost_numpy-devel libboost_chrono-devel libboost_python3-devel libboost_test-devel libboost_headers-devel libboost_test-devel libboost_random-devel libboost_numpy3-devel libboost_graph-devel python3-PyYAML python3 python3-qt5 python3-lxml log4cpp-devel gtest pugixml-devel libpcap-devel armadillo-devel libtool automake hdf5-devel libopenssl-devel python3-Mako python3-six protobuf-devel gmp-devel python3-gmpy fftw3-devel python3-pyFFTW libmatio-devel
+    - zypper -n install cmake git gcc-c++ gcc-fortran ninja boost-devel libboost_atomic-devel libboost_filesystem-devel libboost_system-devel libboost_date_time-devel libboost_thread-devel libboost_regex-devel libboost_serialization-devel libboost_program_options-devel libboost_math-devel libboost_numpy-devel libboost_chrono-devel libboost_python3-devel libboost_test-devel libboost_headers-devel libboost_test-devel libboost_random-devel libboost_numpy3-devel libboost_graph-devel python3-PyYAML python3 python3-qt5 python3-lxml log4cpp-devel libpcap-devel libtool automake hdf5-devel libopenssl-devel python3-Mako python3-six protobuf-devel gmp-devel python3-gmpy fftw3-devel python3-pyFFTW llvm-clang blas-devel lapack-devel
     - mkdir gnuradio && cd gnuradio
     - git clone --recursive https://github.com/gnuradio/gnuradio
     - cd gnuradio && mkdir build && cd build
@@ -148,10 +148,18 @@ c++17:
     - make install
     - cd ../../../build
     - cmake -DENABLE_RAW_UDP=ON ..
-    - make -j$(($NPROC+1))
+    - make -j$(($NPROC+1)) VERBOSE=1
     - make check
     - make install
     - volk_gnsssdr_profile -i 3 -v 2053
+    - make uninstall
+    - rm -rf *
+    - rm -rf ../thirdparty
+    - cmake -GNinja -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ ..
+    - ninja
+    - ninja check
+    - ninja install
+    - volk_gnsssdr_profile -i 3 -v 2053 
   when: manual
   allow_failure: true