Point to OpenSSL on MacOS

Author: jasagredo

.github/workflows/haskell.yml

@@ -30,6 +30,9 @@ jobs:
     env:
       # current ref from: 27.02.2022
       SECP256K1_REF: ac83be33d0956faf6b7f61a60ab524ef7d6a473a
+      # OpenSSL is installed in a non-standard location in MacOS. See
+      # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11-Readme.md
+      PKG_CONFIG_PATH: ${{ matrix.os == 'macos-latest' && '/usr/local/opt/[email protected]/lib/pkgconfig' || '' }}
 
     steps:
 
@@ -52,7 +55,6 @@ jobs:
           mingw-w64-x86_64-cmake
           mingw-w64-x86_64-jq
 
-
     - name: "LINUX,MAC: Setup haskell"
       if: matrix.os != 'windows-latest'
       uses: haskell/actions/setup@v1
@@ -149,7 +151,6 @@ jobs:
       run: |
         brew install libsodium
         brew install lmdb
-        brew install openssl
 
     - name: "MAC: Install build environment (secp256k1)"
       if: matrix.os == 'macos-latest'