Merge pull request #124068 from risicle/ris-igraph-arpack-darwin-blas-paths

igraph,arpack: correct libblas.dylib's path on darwin, fixing python3Packages.python-igraph

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/";

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 = ''