diff --git a/gexec/build.go b/gexec/build.go
index 220c8c4..d11b2fd 100644
--- a/gexec/build.go
+++ b/gexec/build.go
@@ -24,13 +24,24 @@
 Build uses the $GOPATH set in your environment.  It passes the variadic args on to `go build`.
 */
 func Build(packagePath string, args ...string) (compiledPath string, err error) {
-	return BuildIn(os.Getenv("GOPATH"), packagePath, args...)
+	return doBuild(os.Getenv("GOPATH"), packagePath, nil, args...)
+}
+
+/*
+BuildWithEnvironment is identical to Build but allows you to specify env vars to be set at build time.
+*/
+func BuildWithEnvironment(packagePath string, env []string, args ...string) (compiledPath string, err error) {
+	return doBuild(os.Getenv("GOPATH"), packagePath, env, args...)
 }
 
 /*
 BuildIn is identical to Build but allows you to specify a custom $GOPATH (the first argument).
 */
 func BuildIn(gopath string, packagePath string, args ...string) (compiledPath string, err error) {
+	return doBuild(gopath, packagePath, nil, args...)
+}
+
+func doBuild(gopath, packagePath string, env []string, args ...string) (compiledPath string, err error) {
 	tmpDir, err := temporaryDirectory()
 	if err != nil {
 		return "", err
@@ -50,6 +61,7 @@
 
 	build := exec.Command("go", cmdArgs...)
 	build.Env = append([]string{"GOPATH=" + gopath}, os.Environ()...)
+	build.Env = append(build.Env, env...)
 
 	output, err := build.CombinedOutput()
 	if err != nil {
diff --git a/gexec/build_test.go b/gexec/build_test.go
index 7bd62fe..8df0790 100644
--- a/gexec/build_test.go
+++ b/gexec/build_test.go
@@ -1,14 +1,16 @@
 package gexec_test
 
 import (
+	"os"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gexec"
 )
 
-var _ = Describe(".Build", func() {
-	var packagePath = "./_fixture/firefly"
+var packagePath = "./_fixture/firefly"
 
+var _ = Describe(".Build", func() {
 	Context("when there have been previous calls to Build", func() {
 		BeforeEach(func() {
 			_, err := gexec.Build(packagePath)
@@ -35,3 +37,23 @@
 		})
 	})
 })
+
+var _ = Describe(".BuildWithEnvironment", func() {
+	var err error
+	env := []string{
+		"GOOS=linux",
+		"GOARCH=amd64",
+	}
+
+	It("compiles the specified package with the specified env vars", func() {
+		compiledPath, err := gexec.BuildWithEnvironment(packagePath, env)
+		Ω(err).ShouldNot(HaveOccurred())
+		Ω(compiledPath).Should(BeAnExistingFile())
+	})
+
+	It("returns the environment to a good state", func() {
+		_, err = gexec.BuildWithEnvironment(packagePath, env)
+		Ω(err).ShouldNot(HaveOccurred())
+		Ω(os.Environ()).ShouldNot(ContainElement("GOOS=linux"))
+	})
+})