From 1241d9fae3451b824506277174b6053a379f4db7 Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 22 May 2021 19:03:56 +0100
Subject: [PATCH 1/2] arpack: fix libblas.dylib's path on darwin

---
 pkgs/development/libraries/science/math/arpack/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/libraries/science/math/arpack/default.nix b/pkgs/development/libraries/science/math/arpack/default.nix
index 23e44bf28b0..a26a3bb6d8d 100644
--- a/pkgs/development/libraries/science/math/arpack/default.nix
+++ b/pkgs/development/libraries/science/math/arpack/default.nix
@@ -46,6 +46,10 @@ stdenv.mkDerivation rec {
     export OMP_NUM_THREADS=2
   '';
 
+  postFixup = lib.optionalString stdenv.isDarwin ''
+    install_name_tool -change libblas.dylib ${blas}/lib/libblas.dylib $out/lib/libarpack.dylib
+  '';
+
   meta = {
     homepage = "https://github.com/opencollab/arpack-ng";
     description = ''

From 73df171f26f426d1e2201e04ad0a7fa556eca17b Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 22 May 2021 19:05:14 +0100
Subject: [PATCH 2/2] igraph: fix libblas.dylib's path on darwin

---
 pkgs/development/libraries/igraph/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/libraries/igraph/default.nix b/pkgs/development/libraries/igraph/default.nix
index 29e12cc8541..0c668525e92 100644
--- a/pkgs/development/libraries/igraph/default.nix
+++ b/pkgs/development/libraries/igraph/default.nix
@@ -96,6 +96,10 @@ stdenv.mkDerivation rec {
     cp -r doc "$out/share"
   '';
 
+  postFixup = lib.optionalString stdenv.isDarwin ''
+    install_name_tool -change libblas.dylib ${blas}/lib/libblas.dylib $out/lib/libigraph.dylib
+  '';
+
   meta = with lib; {
     description = "The network analysis package";
     homepage = "https://igraph.org/";