thodg/libgit2

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5f1ee19..98a353e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -61,12 +61,11 @@ jobs:
           cmake_options: -DUSE_HTTPS=OpenSSL -DREGEX_BACKEND=builtin -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
         -
           os: macos-latest
-          cc: gcc
         -
           os: windows-latest
       fail-fast: false
     env:
-      CC: $({ matrix.platform.cc }}
+      CC: ${{ matrix.platform.cc }}
       CMAKE_GENERATOR: ${{ matrix.platform.cmake_generator }}
       CMAKE_OPTIONS: ${{ matrix.platform.cmake_options }}
     name: Build