Seems like openssl is still needed for hunter build?

.ci/script.sh

@@ -33,11 +33,15 @@ fi
 
 if [ $TRAVIS_OS_NAME == osx ]; then
     # Build the library.
+    export OPENSSL_ROOT_DIR=/usr/local/opt/openssl
     cmake -H. -Bbuild \
+	-DOPENSSL_ROOT_DIR=/usr/local/opt/openssl \
+	-DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl/include \
         -DBUILD_LIB_TESTS=OFF \
         -DBUILD_SHARED_LIBS=ON \
 	-DHUNTER_ENABLED=ON \
 	-DHUNTER_ROOT=/tmp/.deps \
+	-DUSE_BUNDLED_OPENSSL=OFF \
         -DUSE_BUNDLED_GTEST=OFF || true
     cmake --build build
 

.travis.yml

@@ -21,6 +21,7 @@ matrix:
           packages:
             - clang-format
             - ninja
+            - openssl
     - os: linux
       compiler: gcc
       env:

CMakeLists.txt

@@ -14,8 +14,9 @@ option(HUNTER_ENABLED "Enable Hunter package manager" OFF)
 include("cmake/HunterGate.cmake")
 #set(HUNTER_ENABLED OFF)
 HunterGate(
-    URL "https://github.com/cpp-pm/hunter/archive/v0.23.242.tar.gz"
-    SHA1 "503b149d0ebdbc598e498f1669ae828a2136b838"
+    URL "https://github.com/cpp-pm/hunter/archive/v0.23.244.tar.gz"
+    SHA1 "2c0f491fd0b80f7b09e3d21adb97237161ef9835"
+    LOCAL
 )
 
 option(USE_BUNDLED_BOOST "Use the bundled version of Boost." ${HUNTER_ENABLED})

cmake/Hunter/config.cmake

+hunter_config(Boost VERSION 1.70.0)