Fix gcc-7 & Update Docker (#38)

* Force guacd compile with gcc-6 to resolve gcc-7 compile issues

* Update docker version

guac-install.sh

@@ -4,7 +4,7 @@
 GUACVERSION="0.9.14"
 
 # Update apt so we can search apt-cache for newest tomcat version supported
-apt update
+apt-get update
 
 # Get script arguments for non-interactive mode
 while [ "$1" != "" ]; do
@@ -93,17 +93,28 @@ fi
 #TOMCAT=""
 
 # Install features
-apt -y install build-essential libcairo2-dev ${JPEGTURBO} ${LIBPNG} libossp-uuid-dev libavcodec-dev libavutil-dev \
+apt-get -y install build-essential libcairo2-dev ${JPEGTURBO} ${LIBPNG} libossp-uuid-dev libavcodec-dev libavutil-dev \
 libswscale-dev libfreerdp-dev libpango1.0-dev libssh2-1-dev libtelnet-dev libvncserver-dev libpulse-dev libssl-dev \
 libvorbis-dev libwebp-dev mysql-server mysql-client mysql-common mysql-utilities libmysql-java ${TOMCAT} freerdp-x11 \
 ghostscript wget dpkg-dev
 
 # If apt fails to run completely the rest of this isn't going to work...
 if [ $? -ne 0 ]; then
-    echo "apt failed to install all required dependencies"
+    echo "apt-get failed to install all required dependencies"
     exit
 fi
 
+# Hack for gcc7
+if [[ $(gcc --version | head -n1 | grep -oP '\)\K.*' | awk '{print $1}' | grep "^7" | wc -l) -gt 0 ]]
+then
+    apt-get -y install gcc-6
+    if [ $? -ne 0 ]
+    then
+        echo "apt-get failed to install gcc-6"
+        exit
+    fi
+fi
+
 # Set SERVER to be the preferred download server from the Apache CDN
 SERVER="http://apache.org/dyn/closer.cgi?action=download&filename=guacamole/${GUACVERSION}"
 
@@ -139,11 +150,11 @@ tar -xzf guacamole-auth-jdbc-${GUACVERSION}.tar.gz
 mkdir -p /etc/guacamole/lib
 mkdir -p /etc/guacamole/extensions
 
-# Install guacd
+# Install guacd # Hack for gcc7 #
 cd guacamole-server-${GUACVERSION}
-./configure --with-init-dir=/etc/init.d
-make
-make install
+CC="gcc-6" ./configure --with-init-dir=/etc/init.d
+CC="gcc-6" make
+CC="gcc-6" make install
 ldconfig
 systemctl enable guacd
 cd ..