GHC 8.6 for macOS depends on homebrew

I guess the ghc-8.6.1-x86_64-apple-darwin.tar.xz is build with homebrew. So, it depends on homebrew's "libgmp".

Since I'm using MacPorts, the following error occurs on installation:

% sudo make install

"utils/ghc-cabal/dist-install/build/tmp/ghc-cabal-bindist" copy libraries/ghc-prim dist-install "strip" '' '/usr/local/ghc-8.6.1' '/usr/local/ghc-8.6.1/lib/ghc-8.6.1' '/usr/local/ghc-8.6.1/share/doc/ghc-8.6.1/html/libraries' 'v p dyn'  
dyld: Library not loaded: /usr/local/opt/gmp/lib/libgmp.10.dylib
  Referenced from: /Users/kazu/Downloads/ghc-8.6.1/libraries/base/dist-install/build/libHSbase-4.12.0.0-ghc8.6.1.dylib
  Reason: image not found
make[1]: *** [install_packages] Abort trap: 6
make: *** [install] Error 2

After make a link from "/usr/local/opt/gmp/lib/libgmp.10.dylib" to "/opt/local/lib/libgmp.10.dylib" installed by MacPorts, the installation succeeds.

But when using GHC 8.6.1, the following error occurs:

[15 of 15] Compiling Network.DNS      ( Network/DNS.hs, dist/build/Network/DNS.o )
ld: library not found for -lgmp
clang: error: linker command failed with exit code 1 (use -v to see invocation)
`gcc' failed in phase `Linker'. (Exit code: 1)
cab: callCommand: cabal build (exit 1): failed

To fix this, the following is necessary:

% export LIBRARY_PATH=/usr/lib:/opt/local/lib

• "/usr/lib" is for "libiconv" and should come first to hide "/opt/local/lib/libiconv"
• "/opt/local/lib" is for "libgmp"

Trac metadata

Trac field	Value
Version	8.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
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