diff --git a/Dockerfile b/Dockerfile
index cd16e3c..fd626b3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
 FROM arm32v7/ubuntu:16.04
 MAINTAINER Sasha Gerrand <github+docker-glibc-builder@sgerrand.com>
 ENV PREFIX_DIR /usr/glibc-compat
-ENV GLIBC_VERSION 2.25
+ENV GLIBC_VERSION 2.27
 RUN apt-get -q update \
-	&& apt-get -qy install build-essential wget openssl gawk
+	&& apt-get -qy install bison build-essential wget openssl gawk
 COPY configparams /glibc-build/configparams
 COPY builder /builder
 ENTRYPOINT ["/builder"]
diff --git a/README.md b/README.md
index 13716bc..ad7ab45 100644
--- a/README.md
+++ b/README.md
@@ -4,16 +4,16 @@ A glibc binary package builder in Docker. Produces a glibc binary package that c
 
 ## Usage
 
-Build a glibc package based on version 2.24 with a prefix of `/usr/glibc-compat`:
+Build a glibc package based on version 2.27 with a prefix of `/usr/glibc-compat`:
 
 ```
-docker run --rm -e STDOUT=1 sgerrand/glibc-builder 2.24 /usr/glibc-compat > glibc-bin.tar.gz
+docker run --rm -e STDOUT=1 sgerrand/glibc-builder 2.27 /usr/glibc-compat > glibc-bin.tar.gz
 ```
 
 You can also keep the container around and copy out the resulting file:
 
 ```
-docker run --name glibc-binary sgerrand/glibc-builder 2.24 /usr/glibc-compat
-docker cp glibc-binary:/glibc-bin-2.24.tar.gz ./
+docker run --name glibc-binary sgerrand/glibc-builder 2.27 /usr/glibc-compat
+docker cp glibc-binary:/glibc-bin-2.27.tar.gz ./
 docker rm glibc-binary
 ```
diff --git a/builder b/builder
index 37c355e..6a65c6e 100755
--- a/builder
+++ b/builder
@@ -15,14 +15,8 @@ main() {
 			--prefix="$prefix" \
 			--libdir="$prefix/lib" \
 			--libexecdir="$prefix/lib" \
-			--with-headers="$prefix/include" \
-			--disable-multi-arch \
-			--disable-werror \
-			--host=armv7l-unknown-linux-gnueabihf \
-			--build=armv7l-unknown-linux-gnueabihf
-		install -dm755 "$prefix"/etc
-		touch "$prefix"/etc/ld.so.conf
-		make -j "$(getconf _NPROCESSORS_ONLN)" && make install
+			--enable-multi-arch
+		make -j$(nproc) && make install
 		tar --hard-dereference -zcf "/glibc-bin-$version.tar.gz" "$prefix"
 	} >&2
 
diff --git a/circle.yml b/circle.yml
index 9dafa9e..71fe516 100644
--- a/circle.yml
+++ b/circle.yml
@@ -3,7 +3,7 @@ general:
     - "artifacts"
 machine:
   environment:
-    GLIBC_VERSION: 2.24
+    GLIBC_VERSION: 2.27
   pre:
     - sudo mv /usr/local/go /usr/local/go-1.6.2
     - wget -q -O /tmp/go1.7.3.tgz https://storage.googleapis.com/golang/go1.7.3.linux-amd64.tar.gz
@@ -20,10 +20,10 @@ test:
   pre:
     - mkdir -p artifacts
   override:
-    - "docker run --rm -e STDOUT=1 sgerrand/glibc-builder $GLIBC_VERSION /usr/glibc-compat > artifacts/glibc-bin-$GLIBC_VERSION-$(uname -m).tar.gz"
+    - "docker run --rm -e STDOUT=1 sgerrand/glibc-builder $GLIBC_VERSION /usr/glibc-compat > artifacts/glibc-bin-$GLIBC_VERSION-0-$(uname -m).tar.gz"
 deployment:
   release:
-    tag: /[0-9]+(\.[0-9]+){1,2}(\-r\d+)?$/
+    tag: /[0-9]+(\.[0-9]+){1,2}(\-\d+)?$/
     owner: sgerrand
     commands:
       - ghr -u sgerrand $CIRCLE_TAG artifacts/
@@ -32,4 +32,3 @@ deployment:
     owner: sgerrand
     commands:
       - ghr -u sgerrand --prerelease --delete unreleased artifacts
-      - ghr -u sgerrand --prerelease unreleased artifacts