diff --git a/README.md b/README.md
index c3dac76..8c69f4d 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 GSL.jl
 ======
 
-[![Build Status](https://travis-ci.org/JuliaMath/GSL.jl.svg?branch=master)](https://travis-ci.org/JuliaMath/GSL.jl)
+[![Travis Build Status](https://travis-ci.org/JuliaMath/GSL.jl.svg?branch=master)](https://travis-ci.org/JuliaMath/GSL.jl)
+[![Appveyor Build status](https://ci.appveyor.com/api/projects/status/7049flml50cs65mu/branch/master?svg=true)](https://ci.appveyor.com/project/simonbyrne/gsl-jl/branch/master)
 [![codecov.io](http://codecov.io/github/JuliaMath/GSL.jl/coverage.svg?branch=master)](http://codecov.io/github/JuliaMath/GSL.jl?branch=master)
 
 Julia interface to the [GNU Scientific Library (GSL)](http://www.gnu.org/software/gsl)
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..e08da30
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,44 @@
+environment:
+  matrix:
+  - julia_version: 0.6
+  - julia_version: 0.7
+  - julia_version: 1
+  - julia_version: nightly
+
+platform:
+  - x86 # 32-bit
+  - x64 # 64-bit
+
+# # Uncomment the following lines to allow failures on nightly julia
+# # (tests will run but not make your overall status red)
+# matrix:
+#   allow_failures:
+#   - julia_version: nightly
+
+branches:
+  only:
+    - master
+    - /release-.*/
+
+notifications:
+  - provider: Email
+    on_build_success: false
+    on_build_failure: false
+    on_build_status_changed: false
+
+install:
+  - ps: iex ((new-object net.webclient).DownloadString("https://raw.githubusercontent.com/JuliaCI/Appveyor.jl/version-1/bin/install.ps1"))
+
+build_script:
+  - echo "%JL_BUILD_SCRIPT%"
+  - C:\julia\bin\julia -e "%JL_BUILD_SCRIPT%"
+
+test_script:
+  - echo "%JL_TEST_SCRIPT%"
+  - C:\julia\bin\julia -e "%JL_TEST_SCRIPT%"
+
+# # Uncomment to support code coverage upload. Should only be enabled for packages
+# # which would have coverage gaps without running on Windows
+# on_success:
+#   - echo "%JL_CODECOV_SCRIPT%"
+#   - C:\julia\bin\julia -e "%JL_CODECOV_SCRIPT%"
diff --git a/deps/build.jl b/deps/build.jl
index e6e78bc..9ebb7fd 100644
--- a/deps/build.jl
+++ b/deps/build.jl
@@ -1,10 +1,12 @@
 using BinaryProvider # requires BinaryProvider 0.3.0 or later
+using Compat
 
 # Parse some basic command-line arguments
 const verbose = "--verbose" in ARGS
 const prefix = Prefix(get([a for a in ARGS if a != "--verbose"], 1, joinpath(@__DIR__, "usr")))
 products = [
-    LibraryProduct(prefix, ["libgsl."], :libgsl),
+    # work around for https://github.com/JuliaPackaging/BinaryProvider.jl/issues/133
+    LibraryProduct(prefix, [Compat.Sys.iswindows() ? "libgsl" : "libgsl."], :libgsl),
 ]
 
 # Download binaries from hosted location
diff --git a/test/7_24_2_Associated_Legendre_Polynomials_and_Spherical_Harmonics.jl b/test/7_24_2_Associated_Legendre_Polynomials_and_Spherical_Harmonics.jl
index 7544365..ef1944a 100644
--- a/test/7_24_2_Associated_Legendre_Polynomials_and_Spherical_Harmonics.jl
+++ b/test/7_24_2_Associated_Legendre_Polynomials_and_Spherical_Harmonics.jl
@@ -6,14 +6,15 @@ let
     m = 2
     x = 0.5
 
-    @test sf_legendre_Plm_array(lmax, m, x)         == [2.25, 5.625, 4.21875, -4.921875]
-    @test sf_legendre_Plm_deriv_array(lmax, m, x)   == ([2.25,5.625,4.21875,-4.921875],
-                                                        [-3.0,3.75,33.75,55.78125])
-    @test sf_legendre_sphPlm_array(lmax, m, x)      == [0.2897056515173923, 0.38324455366248106, 
+    # these give subtly different answers on 32/64-bit.    
+    @test sf_legendre_Plm_array(lmax, m, x)         ≈ [2.25, 5.625, 4.21875, -4.921875]
+    @test sf_legendre_Plm_deriv_array(lmax, m, x)[1] ≈ [2.25,5.625,4.21875,-4.921875]
+    @test sf_legendre_Plm_deriv_array(lmax, m, x)[2] ≈ [-3.0,3.75,33.75,55.78125]
+    @test sf_legendre_sphPlm_array(lmax, m, x)      ≈ [0.2897056515173923, 0.38324455366248106, 
                                                         0.18816934037548766, -0.15888479843070935]
-    @test sf_legendre_sphPlm_deriv_array(lmax, m, x) ==     ([0.2897056515173923,0.38324455366248106,
-                                                            0.18816934037548766,-0.15888479843070935],
-                                                            [-0.38627420202318974,0.2554963691083207,
-                                                            1.5053547230039015,1.8006943822147061])
+    @test sf_legendre_sphPlm_deriv_array(lmax, m, x)[1]  ≈ [0.2897056515173923,0.38324455366248106,
+                                                            0.18816934037548766,-0.15888479843070935]
+    @test sf_legendre_sphPlm_deriv_array(lmax, m, x)[2]  ≈ [-0.38627420202318974,0.2554963691083207,
+                                                            1.5053547230039015,1.8006943822147061]
 
 end