diff --git a/build b/build
index 7e68f5b3..2d835afe 100755
--- a/build
+++ b/build
@@ -2,9 +2,18 @@
 
 source ./env
 
-go install -ldflags="$LD_FLAGS" github.com/coreos/dex/cmd/dex-worker
-go install -ldflags="$LD_FLAGS" github.com/coreos/dex/cmd/dexctl
-go install -ldflags="$LD_FLAGS" github.com/coreos/dex/cmd/dex-overlord
+CMDS=( "dex-worker" "dexctl" "dex-overlord" "gendoc")
+FORMAT='{{ range $i, $dep := .Deps }}{{ $dep }} {{ end }}'
+
+for CMD in ${CMDS[@]}; do
+	TARGET="github.com/coreos/dex/cmd/$CMD"
+	# Install command dependencies. This caches package builds and speeds
+	# up successive builds a lot.
+	go list -f="$FORMAT" $TARGET | xargs go install -ldflags="$LD_FLAGS"
+
+	# Build the actual command.
+	go build -o="bin/$CMD" -ldflags="$LD_FLAGS" $TARGET
+done
+
 go build -o bin/example-app github.com/coreos/dex/examples/app
 go build -o bin/example-cli github.com/coreos/dex/examples/cli
-go install github.com/coreos/dex/cmd/gendoc
diff --git a/db/client.go b/db/client.go
index eee4e755..6754368a 100644
--- a/db/client.go
+++ b/db/client.go
@@ -10,8 +10,6 @@ import (
 
 	"github.com/coreos/go-oidc/oidc"
 	"github.com/go-gorp/gorp"
-	"github.com/lib/pq"
-	"github.com/mattn/go-sqlite3"
 	"golang.org/x/crypto/bcrypt"
 
 	"github.com/coreos/dex/client"
@@ -217,6 +215,25 @@ func (r *clientIdentityRepo) Authenticate(creds oidc.ClientCredentials) (bool, e
 	return ok, nil
 }
 
+var alreadyExistsCheckers []func(err error) bool
+
+func registerAlreadyExistsChecker(f func(err error) bool) {
+	alreadyExistsCheckers = append(alreadyExistsCheckers, f)
+}
+
+// isAlreadyExistsErr detects database error codes for failing a unique constraint.
+//
+// Because database drivers are optionally compiled, use registerAlreadyExistsChecker to
+// register driver specific implementations.
+func isAlreadyExistsErr(err error) bool {
+	for _, checker := range alreadyExistsCheckers {
+		if checker(err) {
+			return true
+		}
+	}
+	return false
+}
+
 func (r *clientIdentityRepo) New(id string, meta oidc.ClientMetadata) (*oidc.ClientCredentials, error) {
 	secret, err := pcrypto.RandBytes(maxSecretLength)
 	if err != nil {
@@ -229,17 +246,9 @@ func (r *clientIdentityRepo) New(id string, meta oidc.ClientMetadata) (*oidc.Cli
 	}
 
 	if err := r.executor(nil).Insert(cim); err != nil {
-		switch sqlErr := err.(type) {
-		case *pq.Error:
-			if sqlErr.Code == pgErrorCodeUniqueViolation {
-				err = errors.New("client ID already exists")
-			}
-		case *sqlite3.Error:
-			if sqlErr.ExtendedCode == sqlite3.ErrConstraintUnique {
-				err = errors.New("client ID already exists")
-			}
+		if isAlreadyExistsErr(err) {
+			err = errors.New("client ID already exists")
 		}
-
 		return nil, err
 	}
 
diff --git a/db/conn.go b/db/conn.go
index 118b1011..56811c5e 100644
--- a/db/conn.go
+++ b/db/conn.go
@@ -9,10 +9,6 @@ import (
 	"github.com/go-gorp/gorp"
 
 	"github.com/coreos/dex/repo"
-
-	// Import database drivers
-	_ "github.com/lib/pq"
-	_ "github.com/mattn/go-sqlite3"
 )
 
 type table struct {
diff --git a/db/conn_postgres.go b/db/conn_postgres.go
new file mode 100644
index 00000000..dd52dae3
--- /dev/null
+++ b/db/conn_postgres.go
@@ -0,0 +1,15 @@
+package db
+
+// Register the postgres driver.
+
+import "github.com/lib/pq"
+
+func init() {
+	registerAlreadyExistsChecker(func(err error) bool {
+		sqlErr, ok := err.(*pq.Error)
+		if !ok {
+			return false
+		}
+		return sqlErr.Code == pgErrorCodeUniqueViolation
+	})
+}
diff --git a/db/conn_sqlite3.go b/db/conn_sqlite3.go
new file mode 100644
index 00000000..5c2d332b
--- /dev/null
+++ b/db/conn_sqlite3.go
@@ -0,0 +1,17 @@
+// +build cgo
+
+package db
+
+// Register the sqlite3 driver.
+
+import "github.com/mattn/go-sqlite3"
+
+func init() {
+	registerAlreadyExistsChecker(func(err error) bool {
+		sqlErr, ok := err.(*sqlite3.Error)
+		if !ok {
+			return false
+		}
+		return sqlErr.ExtendedCode == sqlite3.ErrConstraintUnique
+	})
+}
diff --git a/env b/env
index 77f046bb..bbf981c8 100644
--- a/env
+++ b/env
@@ -1,5 +1,4 @@
 export GOPATH=${PWD}/Godeps/_workspace
-export GOBIN=${PWD}/bin
 
 rm -rf $GOPATH/src/github.com/coreos/dex
 mkdir -p $GOPATH/src/github.com/coreos/
@@ -7,4 +6,6 @@ mkdir -p $GOPATH/src/github.com/coreos/
 # Only attempt to link dex into godeps if it isn't already there
 [ -d $GOPATH/src/github.com/coreos/dex ] || ln -s ${PWD} $GOPATH/src/github.com/coreos/dex
 
-LD_FLAGS="-X main.version=$(./git-version)"
+export VERSION=$(./git-version)
+
+LD_FLAGS="-X main.version=${VERSION}"
diff --git a/release b/release
index 602c3ec8..21f37d6a 100755
--- a/release
+++ b/release
@@ -1,18 +1,24 @@
 #!/bin/bash -e
 
-VERSION=$(./git-version)
-
 GOARCH=amd64
 OSS=( "darwin" "linux" )
 
+
+source ./env
+
+# cannot cross compile when GOBIN is set.
+# See:
+#   https://golang.org/issue/9769
+#   https://golang.org/issue/11778
+unset GOBIN 
+
 for GOOS in ${OSS[@]}; do
 	name=dex-$VERSION-$GOOS-$GOARCH
 
 	rm -fr $name.tar.gz $name/
 	mkdir $name
 
-	GOOS=$GOOS GOARCH=$GOARCH ./build
-	cp bin/dexctl $name/
+	GOOS=$GOOS GOARCH=$GOARCH go build -o $name/dexctl -ldflags="$LD_FLAGS" github.com/coreos/dex/cmd/dexctl
 
 	tar -czf $name.tar.gz $name/
 	echo "Created ${name}.tar.gz"