cabal.out

# cabal v2-build
Resolving dependencies...
Build profile: -w ghc-<GHCVER> -O1
In order, the following will be built:
 - zlib-1.1 (lib:zlib) (first run)
Configuring zlib-1.1...
Warning: Flags 'con_flict', 'con-flict' all map to the same environment variable 'CABAL_FLAG_con_flict' causing a collision. The value first flag 'con_flict' will be used.
Preprocessing library for zlib-1.1..
Building library for zlib-1.1..