diff --git a/CMakeLists.txt b/CMakeLists.txt
index dac7bdb..fd09b10 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.01)
+cmake_minimum_required(VERSION 3.10)
 
 project(libpolymake_julia)
 
diff --git a/include/jlpolymake/jlpolymake.h b/include/jlpolymake/jlpolymake.h
index f80e59a..e5ca0b4 100644
--- a/include/jlpolymake/jlpolymake.h
+++ b/include/jlpolymake/jlpolymake.h
@@ -45,7 +45,7 @@
 
 #define JLPOLYMAKE_VERSION_MAJOR 0
 #define JLPOLYMAKE_VERSION_MINOR 14
-#define JLPOLYMAKE_VERSION_PATCH 0
+#define JLPOLYMAKE_VERSION_PATCH 2
 
 #define __JLPOLYMAKE_STR_HELPER(x) #x
 #define __JLPOLYMAKE_STR(x) __JLPOLYMAKE_STR_HELPER(x)
diff --git a/src/polymake/generate_deps_tree.jl b/src/polymake/generate_deps_tree.jl
index 9794d5a..5661a34 100644
--- a/src/polymake/generate_deps_tree.jl
+++ b/src/polymake/generate_deps_tree.jl
@@ -24,10 +24,18 @@ function full_artifact_dir(m::Module)
    end
 end
 
-function force_symlink(source::AbstractString, target::AbstractString)
-   tmpfile = tempname(dirname(target); cleanup=false)
-   symlink(source, tmpfile)
-   Base.Filesystem.rename(tmpfile, target)
+function force_symlink(target::AbstractString, link::AbstractString)
+   # the rename operation below should be atomic and make sure the link always points
+   # to a valid directory
+   # but macos disagrees and sometimes reading files below this path fails with `EINVAL`
+   # see also: http://www.weirdnet.nl/apple/rename.html
+   # (it seems to be fixed on hfs+ but not on apfs...)
+   # to reduce the frequency of this we only write the symlink if necessary
+   # (note this does not fully avoid the error)
+   islink(link) && readlink(link) == target && return
+   tmpfile = tempname(dirname(link); cleanup=false)
+   symlink(target, tmpfile)
+   Base.Filesystem.rename(tmpfile, link)
 end
 
 function prepare_deps_tree(targetdir::String)
diff --git a/src/polymake/type_setup.pl b/src/polymake/type_setup.pl
index b857f03..bf4a8c1 100644
--- a/src/polymake/type_setup.pl
+++ b/src/polymake/type_setup.pl
@@ -272,6 +272,7 @@ sub EdgeMap {
 
         Map(String,String),
         Map(String,Int),
+        Map(Int,String),
         Map(Int,Int),
         Map(Integer,Int),
         Map(Rational,Rational),