add pkg-config to circleci build

.circleci/config.yml

@@ -6,7 +6,7 @@ jobs:
       - image: heroku/heroku:16
     steps:
       - checkout
-      - run: apt-get update; apt-get install -y --no-install-recommends cmake autoconf automake libtool git make g++ liblog4cpp5-dev libasound2-dev
+      - run: apt-get update; apt-get install -y --no-install-recommends cmake autoconf automake libtool git make g++ liblog4cpp5-dev libasound2-dev pkg-config
       - run: cmake . && make
       - run: cpack .
       - run: mkdir -p /distrib && cp *.deb /distrib 
@@ -21,7 +21,7 @@ jobs:
       - image: heroku/heroku:16
     steps:
       - checkout
-      - run: apt-get update; apt-get install -y --no-install-recommends cmake autoconf automake libtool git make 
+      - run: apt-get update; apt-get install -y --no-install-recommends cmake autoconf automake libtool git make pkg-config
       - run: git clone --depth 1 https://github.com/raspberrypi/tools.git rpi_tools 
       - run: echo 'export PATH=${CIRCLE_WORKING_DIRECTORY}/rpi_tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:$PATH' >> $BASH_ENV
       - run: cmake -DCMAKE_TOOLCHAIN_FILE=${CIRCLE_WORKING_DIRECTORY}/raspberry.toolchain . && make
@@ -38,7 +38,7 @@ jobs:
       - image: heroku/heroku:16
     steps:
       - checkout
-      - run: apt-get update; apt-get install -y --no-install-recommends cmake autoconf automake libtool git make g++-mips-linux-gnu
+      - run: apt-get update; apt-get install -y --no-install-recommends cmake autoconf automake libtool git make g++-mips-linux-gnu pkg-config
       - run: cmake -DCMAKE_TOOLCHAIN_FILE=${CIRCLE_WORKING_DIRECTORY}/mips.toolchain . && make
       - run: cpack .
       - run: mkdir -p /distrib && cp *.deb /distrib