Start trying to fix Ante

langs/ante.yaml

@@ -9,6 +9,7 @@ install:
       - cargo
       - cmake
       - libssl-dev
+      - libunwind-dev
       - pkg-config
       - python3-distutils
     manual: |
@@ -17,8 +18,8 @@ install:
       llvmenv init
       # If compiler is not explicitly set to LLVM, then we get an
       # error: unrecognized command-line option ‘-Wnewline-eof’.
-      CC=/usr/bin/clang CXX=/usr/bin/clang++ llvmenv build-entry -G Makefile -j$(nproc) 10.0.0
-      llvmenv global 10.0.0
+      CC=/usr/bin/clang CXX=/usr/bin/clang++ llvmenv build-entry -G Makefile -j$(nproc) 12.0.1
+      llvmenv global 12.0.1
   manual: |
     git clone https://github.com/jfecher/ante.git
     pushd ante