"make install" with non-standard umask causes bad permission on package.cache

Using Debian 8 binary package ghc-8.2.1-x86_64-deb8-linux.tar.xz to install with configure and then su and make install.

If your umask is 0027 rather than the default 0022, a file doesn't get made world-readable. (Other files in this directory do though.)

$ ls -l /usr/local/lib/ghc-8.2.1/package.conf.d/package.cache
-rw-r----- 1 root staff 161490 Jul 23 10:02 /usr/local/lib/ghc-8.2.1/package.conf.d/package.cache

It results in this message when trying to use ghc or ghci:

$ ghci
GHCi, version 8.2.1: http://www.haskell.org/ghc/  :? for help
/usr/local/lib/ghc-8.2.1/package.conf.d/package.cache: openBinaryFile: permission denied (Permission denied)

(n.b. I have set the version field in this bug to 8.2.1-rc3 for now because 8.2.1 isn't in the list yet.)

Trac metadata

Trac field	Value
Version	8.2.1-rc3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	None
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture