added arrayfire in LDFLAGS and INCLUDE

.travis.yml

@@ -93,10 +93,10 @@ matrix:
 install:
 # setup environment to allow install on the home directory
   - export PATH="$HOME/opt/bin:$PATH"
-  - export CPATH="$HOME/opt/include:$CPATH"
-  - export INCLUDE="$HOME/opt/include:$INCLUDE"
-  - export LIBRARY_PATH="$HOME/opt/lib:$LIBRARY_PATH"
-  - export LD_LIBRARY_PATH="$HOME/opt/lib:$LD_LIBRARY_PATH"
+  - export CPATH="$HOME/opt/include:$HOME/opt/arrayfire/include:$CPATH"
+  - export INCLUDE="$HOME/opt/include:$HOME/opt/arrayfire/include:$INCLUDE"
+  - export LIBRARY_PATH="$HOME/opt/lib:$HOME/opt/arrayfire/lib:$LIBRARY_PATH"
+  - export LD_LIBRARY_PATH="$HOME/opt/lib:$HOME/opt/arrayfire/lib:$LD_LIBRARY_PATH"
 # Setting the TMPDIR in this way allegedly prevents problems with the compilation of 
 # PLUMED + Python on macos
   - export TMPDIR="/tmp"