Travis: add a missing macOS asciidoc dependency

diff --git a/.travis.yml b/.travis.yml
index 7583eb74903197863fcba5bea1c71ad6c97c59f8..eed137181832843cafccdef87069069467c1d968 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -124,6 +124,7 @@ install:
   - if [[ "$COVERAGE_OPTIONS" != "" ]]; then pip install --user cpp-coveralls; fi
   ## If we're on OSX, and using asciidoc, install asciidoc
   - if [[ "$ASCIIDOC_OPTIONS" == "" ]] && [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install asciidoc; fi
+  - if [[ "$ASCIIDOC_OPTIONS" == "" ]] && [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install xmlto; fi
   ##
   ## Finally, list installed package versions
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then dpkg-query --show; fi