thodg/libgit2

diff --git a/script/cibuild.sh b/script/cibuild.sh
index 8983dcc..82cf725 100755
--- a/script/cibuild.sh
+++ b/script/cibuild.sh
@@ -1,5 +1,15 @@
 #!/bin/sh
 
+# Fail fast for superseded builds to PR's
+if ! [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
+    if ! [ \"$TRAVIS_BUILD_NUMBER\" = $(curl -H "Accept: application/vnd.travis-ci.2+json" \
+        https://api.travis-ci.org/repos/libgit2/libgit2/builds?event_type=pull_request | \
+        jq ".builds | map(select(.pull_request_number == $TRAVIS_PULL_REQUEST))[0].number") ]; then
+        echo "There are newer queued builds for this pull request, failing early."
+        exit 1
+    fi
+fi
+
 if [ -n "$COVERITY" ];
 then
 	./script/coverity.sh;
diff --git a/script/install-deps-linux.sh b/script/install-deps-linux.sh
index 347922b..3eb57ce 100755
--- a/script/install-deps-linux.sh
+++ b/script/install-deps-linux.sh
@@ -3,4 +3,4 @@
 set -x
 
 sudo apt-get -qq update &&
-sudo apt-get -qq install cmake libssh2-1-dev openssh-client openssh-server
+sudo apt-get -qq install cmake libssh2-1-dev openssh-client openssh-server jq
diff --git a/script/install-deps-osx.sh b/script/install-deps-osx.sh
index c2e0162..ad6a7b4 100755
--- a/script/install-deps-osx.sh
+++ b/script/install-deps-osx.sh
@@ -2,4 +2,4 @@
 
 set -x
 
-brew install libssh2 cmake
+brew install libssh2 cmake jq