Travis CI: install to check if the files are copied correctly

.travis.yml

@@ -31,6 +31,7 @@ matrix:
         - ./configure
         - make -C tmp
         - otool -L build/vpnserver/vpnserver
+        - sudo make -C tmp install
 
 addons:
   apt:
@@ -55,4 +56,5 @@ script:
   - ./configure
   - make -C tmp
   - ldd build/vpnserver/vpnserver
+  - sudo LD_LIBRARY_PATH="${HOME}/opt/lib:${LD_LIBRARY_PATH:-}" make -C tmp install
   - if [ "${BUILD_DEB}" = "1" ]; then make package -C tmp; fi