build: Enable verbose osx build output on travis
diff --git a/.travis/script.sh b/.travis/script.sh
index 8c9aac9..47d3daf 100755
--- a/.travis/script.sh
+++ b/.travis/script.sh
@@ -10,7 +10,7 @@
 # ODIN II errors out due to some unsuppored coding style in clang++
 # VPR is working
 if [[ $TRAVIS_OS_NAME == 'osx' ]]; then
-  make CMAKE_PARAMS="-DVTR_ASSERT_LEVEL=3 -DWITH_BLIFEXPLORER=on" -j2
+  make CMAKE_PARAMS="-DVTR_ASSERT_LEVEL=3 -DWITH_BLIFEXPLORER=on -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON" -j2
 else 
 # For linux, we enable full package compilation
   make CMAKE_PARAMS="-DVTR_ASSERT_LEVEL=3 -DWITH_BLIFEXPLORER=on" -j2