Use python path from PyCall instaed of Conda.jl

deps/build.jl

@@ -1,21 +1,11 @@
 using Conda
+using PyCall
 
 function install_miplearn()
-    paths = [joinpath(Conda.ROOTENV, "Scripts"),
-             joinpath(Conda.ROOTENV, "Library", "bin"),
-             joinpath(Conda.ROOTENV, "bin")]
-
-    pip_found = false
-    for p in paths
-        if isfile("$p/pip3")
-            run(`$p/pip3 install miplearn==0.1.0`)
-            pip_found = true
-            break
-        end
-    end
-
-    pip_found || error("Could not find pip")
+    Conda.update()
+    pip = joinpath(dirname(pyimport("sys").executable), "pip")
+    isfile(pip) || error("$pip: invalid path")
+    run(`$pip install miplearn==0.1.0`)
 end
 
-Conda.update()
 install_miplearn()