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diff --git a/spec/unit/build_spec.lua b/spec/unit/build_spec.lua
new file mode 100644
index 0000000..e8f1394
--- /dev/null
+++ b/spec/unit/build_spec.lua
@@ -0,0 +1,365 @@
+local test_env = require("spec.util.test_env")
+local lfs = require("lfs")
+local get_tmp_path = test_env.get_tmp_path
+local run = test_env.run
+local testing_paths = test_env.testing_paths
+local write_file = test_env.write_file
+local P = test_env.P
+
+test_env.setup_specs()
+local cfg = require("luarocks.core.cfg")
+local deps = require("luarocks.deps")
+local fs = require("luarocks.fs")
+local path = require("luarocks.path")
+local rockspecs = require("luarocks.rockspecs")
+local build_builtin = require("luarocks.build.builtin")
+
+local c_module_source = [[
+   #include <lua.h>
+   #include <lauxlib.h>
+
+   int luaopen_c_module(lua_State* L) {
+     lua_newtable(L);
+     lua_pushinteger(L, 1);
+     lua_setfield(L, -2, "c_module");
+     return 1;
+   }
+]]
+
+describe("LuaRocks build #unit", function()
+   local runner
+
+   lazy_setup(function()
+      runner = require("luacov.runner")
+      runner.init(testing_paths.testrun_dir .. "/luacov.config")
+      cfg.init()
+      fs.init()
+      deps.check_lua_incdir(cfg.variables)
+      deps.check_lua_libdir(cfg.variables)
+   end)
+
+   lazy_teardown(function()
+      runner.save_stats()
+   end)
+
+   describe("build.builtin", function()
+      it("builtin auto installs files in lua subdir", function()
+         test_env.run_in_tmp(function(tmpdir)
+            lfs.mkdir("lua")
+            write_file("lua_module-1.0-1.rockspec", [[
+               package = "lua_module"
+               version = "1.0-1"
+               source = {
+                  url = "http://example.com/lua_module"
+               }
+               build = {
+                  type = "builtin",
+                  modules = {}
+               }
+            ]], finally)
+            write_file("lua/lua_module.lua", "return 123", finally)
+
+            assert.is_true(run.luarocks_bool("build"))
+            assert.match("[\\/]lua_module%.lua", run.luarocks("show lua_module"))
+         end, finally)
+      end)
+
+      describe("builtin.autodetect_modules", function()
+         local tmpdir
+         local olddir
+
+         before_each(function()
+            tmpdir = get_tmp_path()
+            olddir = lfs.currentdir()
+            lfs.mkdir(tmpdir)
+            lfs.chdir(tmpdir)
+            fs.change_dir(tmpdir)
+         end)
+
+         after_each(function()
+            if olddir then
+               lfs.chdir(olddir)
+               fs.change_dir(olddir)
+               if tmpdir then
+                  lfs.rmdir(tmpdir)
+               end
+            end
+         end)
+
+         local libs = { "foo1", "foo2" }
+         local incdirs = { "$(FOO1_INCDIR)", "$(FOO2_INCDIR)" }
+         local libdirs = { "$(FOO1_LIBDIR)", "$(FOO2_LIBDIR)" }
+
+         it("returns a table of the modules having as location the current directory", function()
+            write_file("module1.lua", "", finally)
+            write_file("module2.c", "", finally)
+            write_file("module3.c", "int luaopen_my_module()", finally)
+            write_file("test.lua", "", finally)
+            write_file("tests.lua", "", finally)
+
+            local modules = build_builtin.autodetect_modules(libs, incdirs, libdirs)
+            assert.same(modules, {
+               module1 = "module1.lua",
+               module2 = {
+                  sources = "module2.c",
+                  libraries = libs,
+                  incdirs = incdirs,
+                  libdirs = libdirs
+               },
+               my_module = {
+                  sources = "module3.c",
+                  libraries = libs,
+                  incdirs = incdirs,
+                  libdirs = libdirs
+               }
+            })
+         end)
+
+         local test_with_location = function(location)
+            lfs.mkdir(location)
+            lfs.mkdir(location .. "/dir1")
+            lfs.mkdir(location .. "/dir1/dir2")
+
+            write_file(location .. "/module1.lua", "", finally)
+            write_file(location .. "/dir1/module2.c", "", finally)
+            write_file(location .. "/dir1/dir2/module3.c", "int luaopen_my_module()", finally)
+            write_file(location .. "/test.lua", "", finally)
+            write_file(location .. "/tests.lua", "", finally)
+
+            local modules = build_builtin.autodetect_modules(libs, incdirs, libdirs)
+            assert.same(modules, {
+               module1 = P(location .. "/module1.lua"),
+               ["dir1.module2"] = {
+                  sources = P(location .. "/dir1/module2.c"),
+                  libraries = libs,
+                  incdirs = incdirs,
+                  libdirs = libdirs
+               },
+               my_module = {
+                  sources = P(location .. "/dir1/dir2/module3.c"),
+                  libraries = libs,
+                  incdirs = incdirs,
+                  libdirs = libdirs
+               }
+            })
+
+            lfs.rmdir(location .. "/dir1/dir2")
+            lfs.rmdir(location .. "/dir1")
+            lfs.rmdir(location)
+         end
+
+         it("returns a table of the modules having as location the src directory", function()
+            test_with_location("src")
+         end)
+
+         it("returns a table of the modules having as location the lua directory", function()
+            test_with_location("lua")
+         end)
+
+         it("returns as second and third argument tables of the bin files and copy directories", function()
+            lfs.mkdir("doc")
+            lfs.mkdir("docs")
+            lfs.mkdir("samples")
+            lfs.mkdir("tests")
+            lfs.mkdir("bin")
+            write_file("bin/binfile", "", finally)
+
+            local _, install, copy_directories = build_builtin.autodetect_modules({}, {}, {})
+            assert.same(install, { bin = { P"bin/binfile" } })
+            assert.same(copy_directories, { "doc", "docs", "samples", "tests" })
+
+            lfs.rmdir("doc")
+            lfs.rmdir("docs")
+            lfs.rmdir("samples")
+            lfs.rmdir("tests")
+            lfs.rmdir("bin")
+         end)
+      end)
+
+      describe("builtin.run", function()
+         local tmpdir
+         local olddir
+
+         before_each(function()
+            tmpdir = get_tmp_path()
+            olddir = lfs.currentdir()
+            lfs.mkdir(tmpdir)
+            lfs.chdir(tmpdir)
+            fs.change_dir(tmpdir)
+            path.use_tree(lfs.currentdir())
+         end)
+
+         after_each(function()
+            if olddir then
+               lfs.chdir(olddir)
+               fs.change_dir(olddir)
+               if tmpdir then
+                  lfs.rmdir(tmpdir)
+               end
+            end
+         end)
+
+         it("returns false if the rockspec has no build modules and its format does not support autoextraction", function()
+            local rockspec = {
+               package = "test",
+               version = "1.0-1",
+               source = {
+                  url = "http://example.com/test"
+               },
+               build = {}
+            }
+
+            rockspecs.from_persisted_table("test-1.0-1.rockspec", rockspec)
+            assert.falsy(build_builtin.run(rockspec))
+            rockspec.rockspec_format = "1.0"
+            assert.falsy(build_builtin.run(rockspec))
+         end)
+
+         it("returns false if lua.h could not be found", function()
+            local rockspec = {
+               package = "c_module",
+               version = "1.0-1",
+               source = {
+                  url = "http://example.com/c_module"
+               },
+               build = {
+                  type = "builtin",
+                  modules = {
+                     c_module = "c_module.c"
+                  }
+               }
+            }
+            write_file("c_module.c", c_module_source, finally)
+
+            rockspecs.from_persisted_table("c_module-1.0-1.rockspec", rockspec)
+            rockspec.variables = { LUA_INCDIR = "invalid" }
+            assert.falsy(build_builtin.run(rockspec))
+         end)
+
+         it("returns false if the build fails", function()
+            local rockspec = {
+               package = "c_module",
+               version = "1.0-1",
+               source = {
+                  url = "http://example.com/c_module"
+               },
+               build = {
+                  type = "builtin",
+                  modules = {
+                     c_module = "c_module.c"
+                  }
+               }
+            }
+            write_file("c_module.c", c_module_source .. "invalid", finally)
+
+            rockspecs.from_persisted_table("c_module-1.0-1.rockspec", rockspec)
+            assert.falsy(build_builtin.run(rockspec))
+         end)
+
+         it("returns true if the build succeeds with C module", function()
+            local rockspec = {
+               package = "c_module",
+               version = "1.0-1",
+               source = {
+                  url = "http://example.com/c_module"
+               },
+               build = {
+                  type = "builtin",
+                  modules = {
+                     c_module = "c_module.c"
+                  }
+               }
+            }
+            write_file("c_module.c", c_module_source, finally)
+
+            rockspecs.from_persisted_table("c_module-1.0-1.rockspec", rockspec)
+            assert.truthy(build_builtin.run(rockspec))
+            assert.truthy(lfs.attributes("lib/luarocks/rocks-" .. test_env.lua_version .. "/c_module/1.0-1/lib/c_module." .. test_env.lib_extension))
+         end)
+
+         it("returns true if the build succeeds with Lua module", function()
+            local rockspec = {
+               rockspec_format = "1.0",
+               package = "test",
+               version = "1.0-1",
+               source = {
+                  url = "http://example.com/test"
+               },
+               build = {
+                  type = "builtin",
+                  modules = {
+                     test = "test.lua"
+                  }
+               }
+            }
+            write_file("test.lua", "return {}", finally)
+
+            rockspecs.from_persisted_table("test-1.0-1.rockspec", rockspec)
+            assert.truthy(build_builtin.run(rockspec))
+            assert.truthy(lfs.attributes("lib/luarocks/rocks-" .. test_env.lua_version .. "/test/1.0-1/lua/test.lua"))
+         end)
+
+         it("automatically extracts the modules and libraries if they are not given and builds against any external dependencies", function()
+            local fdir = testing_paths.fixtures_dir
+            if test_env.TEST_TARGET_OS == "windows" then
+               if test_env.MINGW then
+                  os.execute("gcc -shared -o " .. fdir .. "/libfixturedep.dll -Wl,--out-implib," .. fdir .."/libfixturedep.a " .. fdir .. "/fixturedep.c")
+               else
+                  os.execute("cl " .. fdir .. "\\fixturedep.c /link /export:fixturedep_fn /out:" .. fdir .. "\\fixturedep.dll /implib:" .. fdir .. "\\fixturedep.lib")
+               end
+            elseif test_env.TEST_TARGET_OS == "linux" then
+               os.execute("gcc -shared -o " .. fdir .. "/libfixturedep.so " .. fdir .. "/fixturedep.c")
+            elseif test_env.TEST_TARGET_OS == "osx" then
+               os.execute("cc -dynamiclib -o " .. fdir .. "/libfixturedep.dylib " .. fdir .. "/fixturedep.c")
+            end
+
+            local rockspec = {
+               rockspec_format = "3.0",
+               package = "c_module",
+               version = "1.0-1",
+               source = {
+                  url = "http://example.com/c_module"
+               },
+               external_dependencies = {
+                  FIXTUREDEP = {
+                     library = "fixturedep"
+                  }
+               },
+               build = {
+                  type = "builtin"
+               }
+            }
+            write_file("c_module.c", c_module_source, finally)
+
+            rockspecs.from_persisted_table("c_module-1.0-1.rockspec", rockspec)
+            rockspec.variables["FIXTUREDEP_LIBDIR"] = testing_paths.fixtures_dir
+            assert.truthy(build_builtin.run(rockspec))
+         end)
+
+         it("returns false if any external dependency is missing", function()
+            local rockspec = {
+               rockspec_format = "3.0",
+               package = "c_module",
+               version = "1.0-1",
+               source = {
+                  url = "https://example.com/c_module"
+               },
+               external_dependencies = {
+                  EXTDEP = {
+                    library = "missing"
+                  }
+               },
+               build = {
+                  type = "builtin"
+               }
+            }
+            write_file("c_module.c", c_module_source, finally)
+
+            rockspecs.from_persisted_table("c_module-1.0-1.rockspec", rockspec)
+            rockspec.variables["EXTDEP_INCDIR"] = lfs.currentdir()
+            rockspec.variables["EXTDEP_LIBDIR"] = lfs.currentdir()
+            assert.falsy(build_builtin.run(rockspec))
+         end)
+      end)
+   end)
+end)