4 files changed, 104 insertions, 16 deletions
diff --git a/org/config_env.org b/org/config_env.org
index 6dddf9c..e5f2a43 100644
--- a/org/config_env.org
+++ b/org/config_env.org
@@ -141,7 +141,7 @@ export SpineCGIform='spine_search'
 export SpineCGIbin=/var/www/cgi/cgi-bin
 #+END_SRC
 
-* SHARED versions
+* versions GET
 ** direnv
 
 #+NAME: direnv_version
diff --git a/org/config_nix.org b/org/config_nix.org
index cf5e836..195114a 100644
--- a/org/config_nix.org
+++ b/org/config_nix.org
@@ -653,7 +653,7 @@ github:nixos/nixpkgs
 <<./sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org:sisudoc_dlang_nix_overlay_src()>>
 #+END_SRC
 
-** versions dlang overlays versions
+** dlang overlays
 *** ldc
 
 #+NAME: ldc_version
@@ -686,14 +686,14 @@ github:nixos/nixpkgs
 <<./nix-develop-dlang-shared.org:dtools-version()>>
 #+END_SRC
 
-** empty sha56 hash
+** sha256 blank hash
 
-#+NAME: blank_hash
+#+NAME: sha256-blank
 #+BEGIN_SRC nix
-sha256-0000000000000000000000000000000000000000000=
+<<./nix-develop-dlang-shared.org:sha256-blank()>>
 #+END_SRC
 
-#+NAME: assumed_hash
+#+NAME: blank_hash
 #+BEGIN_SRC nix
-sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
+<<./nix-develop-dlang-shared.org:sha256-blank()>>
 #+END_SRC
diff --git a/org/nix-develop-dlang-shared.org b/org/nix-develop-dlang-shared.org
index e40403d..451c53c 100644
--- a/org/nix-develop-dlang-shared.org
+++ b/org/nix-develop-dlang-shared.org
@@ -17,20 +17,51 @@
 
 * nix
 ** direnv
+*** NOTES to update direnv in .envrc-nix
+
+- https://github.com/nix-community/nix-direnv
+
+check for latest version:
+
+- https://github.com/nix-community/nix-direnv/releases
+
+update direnv version and sha hash:
+- emacs org/nix-develop-dlang-shared.org
+
+re-tangle file:
+
+- emacs org/config_env.org
+  updates: .envrc-nix
+
+update flake.lock:
+- nix flake update && nix flake check && nix flake show
+
 *** version SET
 
 #+NAME: direnv-version
 #+BEGIN_SRC org
-<<direnv_version_3_0_6>>
+<<direnv_version_3_0_7>>
 #+END_SRC
 
 #+NAME: direnv-hash
 #+BEGIN_SRC org
-<<direnv_hash_3_0_6>>
+<<direnv_hash_3_0_7>>
 #+END_SRC
 
 *** versions
 
+**** 3.0.7
+
+#+NAME: direnv_version_3_0_7
+#+BEGIN_SRC org
+3.0.7
+#+END_SRC
+
+#+NAME: direnv_hash_3_0_7
+#+BEGIN_SRC org
+sha256-bn8WANE5a91RusFmRI7kS751ApelG02nMcwRekC/qzc=
+#+END_SRC
+
 **** 3.0.6
 
 #+NAME: direnv_version_3_0_6
@@ -81,6 +112,36 @@ sha256-XQzUAvL6pysIJnRJyR7uVpmUSZfc7LSgWQwq/4mBr1U=
 
 * dlang
 ** ldc
+*** NOTES to update ldc
+
+check for latest version:
+
+update ldc version and sha hash:
+- emacs ./org/nix-develop-dlang-shared.org
+
+re-tangle files:
+- emacs ./org/nixpkgs_overlays_d_related.org
+  updates: nix-overlays/ldc/package.nix
+- emacs ./org/config_nix.org
+  updates: flake.nix
+- emacs ./org/config_env.org
+  updates: .envrc-nix
+
+update flake.lock:
+- nix flake update && nix flake check && nix flake show
+
+build:
+- nix build ".#spine-overlay-ldc" --print-build-logs
+
+adjust nix overlay if required (to get started):
+- git clone --depth 1 https://github.com/NixOS/nixpkgs
+- find ./nixpkgs/pkgs/ -type d -name "ldc"
+  ./nixpkgs/pkgs/by-name/ld/ldc
+- compare with overlay:
+  ./nix-overlays/ldc
+- overlay is tangled from:
+  emacs ./org/nixpkgs_overlays_d_related.org
+
 *** version SET
 **** version & sha256 nix composite
 
@@ -94,20 +155,41 @@ sha256 = "<<ldc-hash>>";
 
 #+NAME: ldc-version
 #+BEGIN_SRC org
-<<ldc_version_1_40_1>>
+<<ldc_version_1_41_0>>
 #+END_SRC
 
 #+NAME: ldc-hash
 #+BEGIN_SRC org
-<<ldc_hash_1_40_1>>
+<<ldc_hash_1_41_0>>
 #+END_SRC
 
 #+NAME: ldc-llvm-set
 #+BEGIN_SRC org
-<<ldc_llvm_set_1_40_1>>
+<<ldc_llvm_set_1_41_0>>
 #+END_SRC
 
 *** versions
+**** 1.41 OK ✓
+***** 1.41.0 OK ✓
+
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.41.0.tar.gz
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz
+
+#+NAME: ldc_version_1_41_0
+#+BEGIN_SRC nix
+1.41.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_41_0
+#+BEGIN_SRC nix
+sha256-6LcpY3LSFK4KgEiGrFp/LONu5Vr+/+vI04wEEpF3s+s=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_41_0
+#+BEGIN_SRC nix
+llvm_19
+#+END_SRC
+
 **** 1.40 OK ✓
 ***** 1.40.1 OK ✓
 
@@ -242,6 +324,9 @@ sha256-/bs3bwgkLZF5IqaiKnc5gCF/r6MQBG/F1kWUkK8j2s0=
 #+END_SRC
 
 ** dmd
+
+- https://github.com/dlang/dmd/tags
+
 *** version SET
 
 #+NAME: dmd-version
diff --git a/org/nixpkgs_overlays_d_related.org b/org/nixpkgs_overlays_d_related.org
index 889f79e..18ab78c 100644
--- a/org/nixpkgs_overlays_d_related.org
+++ b/org/nixpkgs_overlays_d_related.org
@@ -1303,7 +1303,7 @@ stdenv.mkDerivation (finalAttrs: {
 })
 #+END_SRC
 
-*** dcompiler SET
+*** dcompiler
 
 #+NAME: dcompiler
 #+BEGIN_SRC nix
@@ -1516,9 +1516,9 @@ Adapted from https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69
      $(ROOT)/catdoc$(DOTEXE) \
 #+END_SRC
 
-** versions SET
+** versions GET
 *** direnv
-***** select version SET OK ✓
+***** select version
 
 #+NAME: direnv_version
 #+HEADER: :noweb yes
@@ -1539,7 +1539,7 @@ Adapted from https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69
 <<./nix-develop-dlang-shared.org:ldc-version-info()>>
 #+END_SRC
 
-***** select version SET OK ✓
+***** selected version
 
 #+NAME: ldc_version
 #+HEADER: :noweb yes
@@ -1558,6 +1558,7 @@ Adapted from https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69
 #+END_SRC
 
 *** dmd
+**** selected version
 
 #+NAME: dmd_version
 #+HEADER: :noweb yes
@@ -1576,6 +1577,7 @@ Adapted from https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69
 #+END_SRC
 
 *** dub
+**** selected version
 
 #+NAME: dub_version
 #+HEADER: :noweb yes
@@ -1589,6 +1591,7 @@ Adapted from https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69
 #+END_SRC
 
 *** dtools
+**** selected version
 
 #+NAME: dtools_version
 #+HEADER: :noweb yes