diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3824088..1166377 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://git.rustybever.be/Chewing_Bever/vieter)
 
+## Added
+
+* Very basic build system
+    * Build is triggered by separate cron container
+    * Packages build on cron container's system
+    * Packages are always rebuilt, even if they haven't changed
+    * Hardcoded planning of builds
+    * Builds are sequential
+
+## Fixed
+
+* Each package can now only have one version in the repository at once
+  (required by Pacman)
+
 ## [0.1.0](https://git.rustybever.be/Chewing_Bever/vieter/src/tag/0.1.0)
 
 ### Changed
diff --git a/src/docker/containers.v b/src/docker/containers.v
index 44b31ac..a6df345 100644
--- a/src/docker/containers.v
+++ b/src/docker/containers.v
@@ -10,7 +10,7 @@ struct Container {
 
 // containers returns a list of all currently running containers
 pub fn containers() ?[]Container {
-	res := request('GET', urllib.parse('/containers/json') ?) ?
+	res := request('GET', urllib.parse('/v1.41/containers/json') ?) ?
 
 	return json.decode([]Container, res.text) or {}
 }
@@ -29,7 +29,7 @@ struct CreatedContainer {
 // create_container creates a container defined by the given configuration. If
 // successful, it returns the ID of the newly created container.
 pub fn create_container(c &NewContainer) ?string {
-	res := request_with_json('POST', urllib.parse('/containers/create') ?, c) ?
+	res := request_with_json('POST', urllib.parse('/v1.41/containers/create') ?, c) ?
 
 	if res.status_code != 201 {
 		return error('Failed to create container.')
@@ -41,7 +41,7 @@ pub fn create_container(c &NewContainer) ?string {
 // start_container starts a container with a given ID. It returns whether the
 // container was started or not.
 pub fn start_container(id string) ?bool {
-	res := request('POST', urllib.parse('/containers/$id/start') ?) ?
+	res := request('POST', urllib.parse('/v1.41/containers/$id/start') ?) ?
 
 	return res.status_code == 204
 }
@@ -59,7 +59,7 @@ pub:
 // inspect_container returns the result of inspecting a container with a given
 // ID.
 pub fn inspect_container(id string) ?ContainerInspect {
-	res := request('GET', urllib.parse('/containers/$id/json') ?) ?
+	res := request('GET', urllib.parse('/v1.41/containers/$id/json') ?) ?
 
 	if res.status_code != 200 {
 		return error('Failed to inspect container.')
@@ -70,7 +70,7 @@ pub fn inspect_container(id string) ?ContainerInspect {
 
 // remove_container removes a container with a given ID.
 pub fn remove_container(id string) ?bool {
-	res := request('DELETE', urllib.parse('/containers/$id') ?) ?
+	res := request('DELETE', urllib.parse('/v1.41/containers/$id') ?) ?
 
 	return res.status_code == 204
 }
diff --git a/src/docker/docker.v b/src/docker/docker.v
index b68a7b4..e0dbf7d 100644
--- a/src/docker/docker.v
+++ b/src/docker/docker.v
@@ -11,7 +11,9 @@ const buf_len = 1024
 
 fn send(req &string) ?http.Response {
 	// Open a connection to the socket
-	mut s := unix.connect_stream(docker.socket) ?
+	mut s := unix.connect_stream(docker.socket) or {
+		return error('Failed to connect to socket ${docker.socket}.')
+	}
 
 	defer {
 		// This or is required because otherwise, the V compiler segfaults for
@@ -21,7 +23,7 @@ fn send(req &string) ?http.Response {
 	}
 
 	// Write the request to the socket
-	s.write_string(req) ?
+	s.write_string(req) or { return error('Failed to write request to socket ${docker.socket}.') }
 
 	s.wait_for_write() ?
 
@@ -30,7 +32,7 @@ fn send(req &string) ?http.Response {
 	mut res := []byte{}
 
 	for {
-		c = s.read(mut buf) or { return error('Failed to read data from socket.') }
+		c = s.read(mut buf) or { return error('Failed to read data from socket ${docker.socket}.') }
 		res << buf[..c]
 
 		if c < docker.buf_len {
@@ -38,20 +40,26 @@ fn send(req &string) ?http.Response {
 		}
 	}
 
-	// If the response isn't a chunked reply, we return early
-	parsed := http.parse_response(res.bytestr()) ?
+	// After reading the first part of the response, we parse it into an HTTP
+	// response. If it isn't chunked, we return early with the data.
+	parsed := http.parse_response(res.bytestr()) or {
+		return error('Failed to parse HTTP response from socket ${docker.socket}.')
+	}
 
 	if parsed.header.get(http.CommonHeader.transfer_encoding) or { '' } != 'chunked' {
 		return parsed
 	}
 
 	// We loop until we've encountered the end of the chunked response
+	// A chunked HTTP response always ends with '0\r\n\r\n'.
 	for res.len < 5 || res#[-5..] != [byte(`0`), `\r`, `\n`, `\r`, `\n`] {
 		// Wait for the server to respond
 		s.wait_for_write() ?
 
 		for {
-			c = s.read(mut buf) or { return error('Failed to read data from socket.') }
+			c = s.read(mut buf) or {
+				return error('Failed to read data from socket ${docker.socket}.')
+			}
 			res << buf[..c]
 
 			if c < docker.buf_len {
@@ -86,5 +94,5 @@ pub fn request_with_json<T>(method string, url urllib.URL, data &T) ?http.Respon
 
 // pull_image pulls tries to pull the image for the given image & tag
 pub fn pull_image(image string, tag string) ?http.Response {
-	return request('POST', urllib.parse('/images/create?fromImage=$image&tag=$tag') ?)
+	return request('POST', urllib.parse('/v1.41/images/create?fromImage=$image&tag=$tag') ?)
 }