Fix Travis CI build

- Install and use GNU GCC 4.8 to support required C++11 standard
- Build Boost (1.55.0) libraries needed by ledger
- Export build and cmake variables to find locally built Boost

1 files changed, 1 insertions, 0 deletions

diff --git a/acprep b/acprep
index dde3e62f..754a2427 100755
--- a/acprep
+++ b/acprep
@@ -868,6 +868,7 @@ class PrepareBuild(CommandLineApp):
         if self.options.boost_root:
             conf_args.append('-DBOOST_ROOT=%s' %
                              self.options.boost_root)
+            conf_args.append('-DBoost_NO_SYSTEM_PATHS=TRUE')
         if self.options.boost_suffix:
             conf_args.append('-DBoost_COMPILER=%s' %
                              self.options.boost_suffix)