Add env vars and bring scripts over

.github/scripts/build.sh

@@ -1 +1,28 @@
 echo "Building..."
+
+sudo apt-get -qq update
+sudo apt-get install -y cmake pkg-config libgnutls28-dev libgmp-dev libffi-dev libicu-dev libxml2-dev libxslt1-dev libssl-dev libavahi-client-dev zlib1g-dev
+
+if [ $LIBRARY_COMBO = 'gnu-gnu-gnu' ];
+then
+  if [ $CC = 'gcc' ];
+  then
+    sudo apt-get install -y gobjc;
+  fi;
+  sudo apt-get install -y libobjc-4.8-dev libblocksruntime-dev;
+  else
+    curl -s -o - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -;
+    sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main" && sudo apt-get update -qq;
+    sudo apt-get install -y clang-9 libkqueue-dev libpthread-workqueue-dev;
+    sudo update-alternatives   --install /usr/bin/clang   clang   /usr/bin/clang-9   10 \
+                               --slave   /usr/bin/clang++ clang++ /usr/bin/clang++-9;
+    export PATH=$(echo "$PATH" | sed -e 's/:\/usr\/local\/clang-7.0.0\/bin//');
+    if [ "$RUNTIME_VERSION" = "gnustep-2.0" ];
+    then
+      sudo update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.gold" 10;
+    fi;
+  fi;
+fi;
+
+# Install dependencies
+./travis-deps.sh

.github/workflows/main.yml

@@ -11,7 +11,10 @@ jobs:
   build:
     # The type of runner that the job will run on
     runs-on: ubuntu-latest
-
+    env:
+      LIBRARY_COMBO=gnu-gnu-gnu
+      CC=gcc
+      
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it