Add support for user specified env vars

Author: gee4vee

bin/compile.sh

@@ -129,6 +129,18 @@ else
   status "No Aptfile found."
 fi
 
+# ----------------------------------------------------------------------------- #
+	# Set any user specified build environment variables.                            #
+	# (Note, this is currently required in order to use Kitura with SwiftNIO.)
+	# ----------------------------------------------------------------------------- #
+	if [ -f $BUILD_DIR/.build_env ]; then
+	  status ".build_env found."
+	  for ENV_VAR in $(cat $BUILD_DIR/.build_env); do
+	    export $ENV_VAR
+	    status "Set build environment variable: $ENV_VAR"
+	  done
+	fi
+
 # ----------------------------------------------------------------------------- #
 # Install Swift dev tools & clang                                               #
 # ----------------------------------------------------------------------------- #