Hi I want to use Agda on my computer and I follow the instruction http://wiki.portal.chalmers.se/agda/pmwiki.php?n=Main.MacOSX However when I was using cabal install Agda to install agda, the terminal said The program cpphs version >=1.18.6 && <1.19 is required but the version found at /Users/XXXXXX/Library/Haskell/bin/cpphs is version 1.19 Do you have some idea how could i fix that problem? Zongzhe Yuan This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.