diff --git a/.travis.yml b/.travis.yml
index 046994f..dc8b24b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ os:
   - linux
 dist: trusty
 julia:
+  - 0.6
   - 0.7
   - nightly
 matrix:
diff --git a/REQUIRE b/REQUIRE
index cdbb2dc..137767a 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1 +1 @@
-julia 0.7-alpha
+julia 0.6
diff --git a/appveyor.yml b/appveyor.yml
index bd2f18c..2401217 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,5 +1,6 @@
 environment:
   matrix:
+  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/0.6/julia-0.6-latest-win64.exe"
   - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x86/julia-latest-win32.exe"
   - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x64/julia-latest-win64.exe"
 
@@ -14,10 +15,6 @@ notifications:
     on_build_failure: false
     on_build_status_changed: false
 
-matrix:
-  allow_failures:
-  - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x86/julia-latest-win32.exe"
-  - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x64/julia-latest-win64.exe"
 
 install:
   - ps: "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12"
diff --git a/src/ModernGL.jl b/src/ModernGL.jl
index a9e3ac9..9af44d4 100644
--- a/src/ModernGL.jl
+++ b/src/ModernGL.jl
@@ -1,7 +1,19 @@
 __precompile__(true)
 module ModernGL
 
-using Libdl
+if VERSION < v"0.7.0-"
+    const Cvoid = Void
+    const iswindows = is_windows
+    const isunix = is_unix
+    const isapple = is_apple
+else
+    using Libdl
+    const iswindows = Sys.iswindows
+    const isunix = Sys.isunix
+    const isapple = Sys.isapple
+end
+
+
 
 function glXGetProcAddress(glFuncName)
     ccall((:glXGetProcAddress, "libGL.so.1"), Ptr{Cvoid}, (Ptr{UInt8},), glFuncName)
@@ -20,12 +32,12 @@ function wglGetProcAddress(glFuncName)
     ccall((:wglGetProcAddress, "opengl32"), Ptr{Cvoid}, (Ptr{UInt8},), glFuncName)
 end
 
-if Sys.isapple()
+if isapple()
     getprocaddress(glFuncName) = NSGetProcAddress(glFuncName)
-elseif Sys.isunix()
+elseif isunix()
     getprocaddress(glFuncName) = glXGetProcAddress(glFuncName)
 end
-if Sys.iswindows()
+if iswindows()
     getprocaddress(glFuncName) = wglGetProcAddress(glFuncName)
 end
 
diff --git a/src/functionloading.jl b/src/functionloading.jl
index 6c8346d..71e0a09 100644
--- a/src/functionloading.jl
+++ b/src/functionloading.jl
@@ -37,7 +37,7 @@ macro glfunc(opengl_func)
     func_name_str   = string(func_name)
     ptr_expr        = :(getprocaddress_e($func_name_str))
 
-    if Sys.iswindows() # windows has some function pointers statically available and some not, this is how we deal with it:
+    if iswindows() # windows has some function pointers statically available and some not, this is how we deal with it:
         ptr = Libdl.dlsym_e(gl_lib, func_name)
         if (ptr != C_NULL)
             ptr_expr = :(($func_name_sym, "opengl32"))
@@ -68,10 +68,10 @@ macro glfunc(opengl_func)
     return esc(ret)
 end
 
-if Sys.iswindows()
+if iswindows()
     const gl_lib = Libdl.dlopen("opengl32")
 end
 include("glFunctions.jl")
-if Sys.iswindows()
+if iswindows()
     Libdl.dlclose(gl_lib)
 end