Try using LD_PRELOAD

.travis.yml

@@ -32,11 +32,11 @@ matrix:
       addons: {apt: {packages: [cabal-install-3.0,ghc-8.8.2], sources: [hvr-ghc]}}
   fast-finish: true
 
-# cache:
-#   directories:
-#     - $HOME/.cabsnap
-#     - $HOME/.cabal/packages
-#     - $HOME/.stack
+cache:
+  directories:
+    - $HOME/.cabsnap
+    - $HOME/.cabal/packages
+    - $HOME/.stack
 
 before_cache:
   - rm -fv $HOME/.cabal/packages/hackage.haskell.org/build-reports.log
@@ -133,7 +133,7 @@ script:
   - echo -en 'travis_fold:end:script.configure\\r'
 ###
   - echo 'Build...' && echo -en 'travis_fold:start:script.build\\r'
-  - cabal v1-build
+  - LD_PRELOAD=/opt/ghc/${GHCVER}/lib/ghc-${GHCVER}/rts/libffi.so.7 cabal v1-build
   - echo -en 'travis_fold:end:script.build\\r'
 ###
   - echo 'Copy...' && echo -en 'travis_fold:start:script.copy\\r'