diff --git a/pkgs/applications/graphics/darktable/default.nix b/pkgs/applications/graphics/darktable/default.nix
index c32766134a9f..948b4ddd54db 100644
--- a/pkgs/applications/graphics/darktable/default.nix
+++ b/pkgs/applications/graphics/darktable/default.nix
@@ -34,8 +34,6 @@ stdenv.mkDerivation rec {
     "-DUSE_KWALLET=OFF"
   ];
 
-  # Doc has high risk of collisions
-  postInstall = "rm -r $out/share/doc";
 
   # darktable changed its rpath handling in commit
   # 83c70b876af6484506901e6b381304ae0d073d3c and as a result the
diff --git a/pkgs/applications/networking/p2p/transmission/default.nix b/pkgs/applications/networking/p2p/transmission/default.nix
index 9d37f1f43981..ab4fc0908ba8 100644
--- a/pkgs/applications/networking/p2p/transmission/default.nix
+++ b/pkgs/applications/networking/p2p/transmission/default.nix
@@ -57,9 +57,6 @@ in stdenv.mkDerivation {
   ++ lib.optionals enableQt [ qt5.wrapQtAppsHook ]
   ;
 
-  # Doc has high risk of collisions
-  postInstall = "rm -r $out/share/doc";
-
   buildInputs = [
     openssl
     curl
diff --git a/pkgs/development/tools/build-managers/cmake/setup-hook.sh b/pkgs/development/tools/build-managers/cmake/setup-hook.sh
index 87bbefa6bbfa..73f24a9a2054 100755
--- a/pkgs/development/tools/build-managers/cmake/setup-hook.sh
+++ b/pkgs/development/tools/build-managers/cmake/setup-hook.sh
@@ -68,6 +68,24 @@ cmakeConfigurePhase() {
     # nix/store directory.
     cmakeFlags="-DCMAKE_INSTALL_NAME_DIR=${!outputLib}/lib $cmakeFlags"
 
+    # The docdir flag needs to include PROJECT_NAME as per GNU guidelines,
+    # try to extract it from CMakeLists.txt.
+    if [[ -z "$shareDocName" ]]; then
+        local cmakeLists="${cmakeDir}/CMakeLists.txt"
+        if [[ -f "$cmakeLists" ]]; then
+            local shareDocName="$(grep --only-matching --perl-regexp --ignore-case '\bproject\s*\(\s*"?\K([^[:space:]")]+)' < "$cmakeLists" | head -n1)"
+        fi
+        # The argument sometimes contains garbage or variable interpolation.
+        # When that is the case, let’s fall back to the derivation name.
+        if [[ -z "$shareDocName" ]] || echo "$shareDocName" | grep -q '[^a-zA-Z0-9_-+]'; then
+            if [[ -n "${pname-}" ]]; then
+                shareDocName="$pname"
+            else
+                shareDocName="$(echo "$name" | sed 's/-[^a-zA-Z].*//')"
+            fi
+        fi
+    fi
+
     # This ensures correct paths with multiple output derivations
     # It requires the project to use variables from GNUInstallDirs module
     # https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html