diff --git a/Justfile b/Justfile
--- a/Justfile
+++ b/Justfile
@@ -1,3 +1,7 @@
+clean:
+    rm test/testmap.*
+    sn c .
+
 upload:
     rm -rf dist/
     cabal sdist
diff --git a/hgis.cabal b/hgis.cabal
--- a/hgis.cabal
+++ b/hgis.cabal
@@ -1,5 +1,5 @@
 name:                hgis
-version:             0.1.3.6
+version:             0.1.3.7
 synopsis:            Package and command-line for GIS with Haskell
 description:         Package containting functions to make graphs, read 
                      shapefiles, and compute areas/perimeters of
@@ -64,12 +64,12 @@
 
 executable hgis
   hs-source-dirs:      app
-  main-is:           MainPng.hs
+  main-is:             MainPng.hs
   if flag(llvm-fast)
     ghc-options:       -threaded -rtsopts -with-rtsopts=-N -fllvm -optlo-O3 -O3
   else
     ghc-options:       -threaded -rtsopts -with-rtsopts=-N
-  build-depends:       base
+  build-depends:       base > 4.9 && < 5
                      , hgis
   default-language:    Haskell2010