diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 000000000..124202888
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+pcre,ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.39.tar.bz2 -H sha256:b858099f82483031ee02092711689e7245586ada49e534a06e678b8ea9549e8b