diff --git a/Dockerfile b/Dockerfile
index 81cdc78..2f208c3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,14 +9,27 @@ ARG version="master"
 # build root
 WORKDIR /build
 
-RUN apk add --no-cache git upx ca-certificates alpine-sdk cmake zlib-dev
+RUN apk add \
+		git \
+		ca-certificates \
+		alpine-sdk \
+		clang \
+		cmake \
+		zlib-static zlib-dev \
+		lua5.1 lua5.1-dev \
+		linux-headers
 # source
 RUN git clone https://github.com/lpereira/lwan -b ${version} .
 
 # build
 RUN mkdir build \
     && cd build \
-    && cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXE_LINKER_FLAGS="-static" -DCMAKE_C_FLAGS="-static" \
+    && cmake \
+		.. \
+		-DCMAKE_C_COMPILER=clang \
+		-DCMAKE_BUILD_TYPE=Release \
+		-DCMAKE_EXE_LINKER_FLAGS="-static" \
+		-DCMAKE_C_FLAGS="-static" \
     && make
 # compress and test
 #RUN cd build \
diff --git a/lwan.conf b/lwan.conf
index 4d23ea2..9b549fb 100644
--- a/lwan.conf
+++ b/lwan.conf
@@ -5,9 +5,6 @@ keep_alive_timeout = 15
 # release builds.)
 quiet = false
 
-# Set SO_REUSEPORT=1 in the master socket.
-reuse_port = false
-
 # Value of "Expires" header. Default is 1 month and 1 week.
 expires = 1M 1w
 
@@ -19,9 +16,7 @@ proxy_protocol = false
 
 # Enable straitjacket by default. The `drop_capabilities` option is `true`
 # by default.  Other options may require more privileges.
-straitjacket {
-    drop_capabilities = false
-}
+straitjacket
 
 listener *:8080 {
     serve_files / {