diff --git a/.travis.yml b/.travis.yml
index 144f7539..66c4efa5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,8 @@ before_script:
   - cat config.log
   - echo PKG_CONFIG_PATH = $PKG_CONFIG_PATH
   - echo which pkg-config ; which pkg-config
+  - pkg-config --list-all
+  - pkg-config --debug
   - make -j$JOBS -s V=0
 script:
   - make -Ctest -j$JOBS -s V=0 VERBOSE=1 check