run pre/post hooks

pkgs/nim-packages/generic.nix

@@ -43,13 +43,19 @@ stdenv.mkDerivation {
   LD_LIBRARY_PATH = makeLibraryPath (rBuildInputs ++ rNativeBuildInputs);
 
   buildPhase = ''
+    runHook preBuild
+
     HOME=$TMPDIR
     NIMBLE_DIR=$HOME/.nimble
   '' + copyNimDeps + ''
     nimble install
+
+    runHook PostBuild
   '';
 
   installPhase = ''
+    runHook preInstall
+
     mkdir $out
     if [ -d $NIMBLE_DIR/bin ]; then
       cp -RL $NIMBLE_DIR/bin $out
@@ -60,6 +66,8 @@ stdenv.mkDerivation {
       mkdir -p $out/.nimble
       cp -R $NIMBLE_DIR/pkgs $out/.nimble
     fi
+
+    runHook postInstall
   '';
 
   shellHook = ''