update circleci/config.yml

Author: treefrogframework

.circleci/config.yml

@@ -27,9 +27,9 @@ jobs:
     working_directory: /workspace
     steps:
       - checkout
-      - run: apt-get update -qq; apt install -y --no-install-recommends gcc g++ make cmake qtbase5-dev qt5-default qt5-qmake qttools5-dev-tools qtdeclarative5-dev qtdeclarative5-dev-tools libqt5sql5 libqt5sql5-sqlite libsqlite3-dev libmongoc-dev libbson-dev
+      - run: apt-get update -qq; apt install -y --no-install-recommends gcc g++ clang make cmake qtbase5-dev qt5-default qt5-qmake qttools5-dev-tools qtdeclarative5-dev qtdeclarative5-dev-tools libqt5sql5 libqt5sql5-sqlite libsqlite3-dev libmongoc-dev libbson-dev
       - run: qmake -v
-      - run: ./configure --prefix=/usr/local --enable-shared-mongoc
+      - run: ./configure --prefix=/usr/local --enable-shared-mongoc --spec=linux-clang
       - run: make -j4 -C src && make -C src install && make -j4 -C tools && make -C tools install
       - run: treefrog -v
   test: