diff --git a/pkgs/applications/science/logic/hol_light/default.nix b/pkgs/applications/science/logic/hol_light/default.nix
index 932412daf75c..f923095f857e 100644
--- a/pkgs/applications/science/logic/hol_light/default.nix
+++ b/pkgs/applications/science/logic/hol_light/default.nix
@@ -1,4 +1,4 @@
-{stdenv, writeText, writeTextFile, ocaml, camlp5_transitional, hol_light_sources}:
+{stdenv, writeText, writeTextFile, ocaml, findlib, camlp5_transitional, hol_light_sources}:
 
 let
   version = hol_light_sources.version;
@@ -10,11 +10,11 @@ let
   pa_j_cmo = stdenv.mkDerivation {
     name = "pa_j.cmo";
     inherit ocaml camlp5; 
-    buildInputs = [ ocaml camlp5 ];
+    buildInputs = [ ocaml camlp5 findlib ];
     buildCommand = ''
       ocamlc -c \
         -pp "camlp5r pa_lexer.cmo pa_extend.cmo q_MLast.cmo" \
-        -I "${camlp5}/lib/ocaml/camlp5" \
+        -I "$(ocamlfind query camlp5)" \
         -o $out \
         "${hol_light_src_dir}/pa_j_`ocamlc -version | cut -c1-4`.ml"
       '';
@@ -22,7 +22,7 @@ let
 
   start_ml = writeText "start.ml" ''
     Topdirs.dir_directory "${hol_light_src_dir}";;
-    Topdirs.dir_directory "${camlp5}/lib/ocaml/camlp5";;
+    Topdirs.dir_directory ("${camlp5}/lib/ocaml/"^Sys.ocaml_version^"/site-lib/camlp5");;
     Topdirs.dir_load Format.std_formatter "camlp5o.cma";;
     Topdirs.dir_load Format.std_formatter "${pa_j_cmo}";;
     #use "${hol_light_src_dir}/make.ml";;
diff --git a/pkgs/development/tools/ocaml/findlib/default.nix b/pkgs/development/tools/ocaml/findlib/default.nix
index 9a5b9acbef9c..a8000d2cf0e1 100644
--- a/pkgs/development/tools/ocaml/findlib/default.nix
+++ b/pkgs/development/tools/ocaml/findlib/default.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation {
             export OCAMLPATH="''${OCAMLPATH}''${OCAMLPATH:+:}''$1/lib/ocaml/${ocaml_version}/site-lib/"
         fi
         export OCAMLFIND_DESTDIR="''$out/lib/ocaml/${ocaml_version}/site-lib/"
-        if test -n $createFindlibDestdir; then
+        if test -n "$createFindlibDestdir"; then
           ensureDir $OCAMLFIND_DESTDIR
         fi
     }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2eda702e5c79..d4632cdfec8b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7035,7 +7035,7 @@ let
   hol = callPackage ../applications/science/logic/hol { };
 
   hol_light = callPackage ../applications/science/logic/hol_light {
-    inherit (ocamlPackages) camlp5_transitional;
+    inherit (ocamlPackages) findlib camlp5_transitional;
   };
 
   hol_light_sources = callPackage ../applications/science/logic/hol_light/sources.nix { };