Try new approach, this time starting with ubuntu-based official emsdk image

povray_wasm/Dockerfile

@@ -1,34 +1,5 @@
-FROM frolvlad/alpine-gxx
+#!/bin/bash
 
-RUN apk update
+FROM emscripten/emsdk:latest
 
-RUN apk add --update \
+RUN ls
-	bash \
-	git \
-	coreutils \
-	build-base \
-	boost-dev \
-	zlib-dev \
-	libpng-dev \
-	jpeg-dev \
-	tiff-dev \
-	openexr-dev \
-	sdl-dev \
-	autoconf \
-	automake \ 
-	make
-
-RUN pwd
-
-WORKDIR /usr/src/
-
-RUN cd /usr/src/ && git clone https://github.com/emscripten-core/emsdk.git emsdk
-
-ENV POVRAY_VERSION=3.7-stable
-RUN cd /usr/src/ && git clone --depth 1 --branch $POVRAY_VERSION https://github.com/POV-Ray/povray povray
-
-RUN cd /usr/src/emsdk && ./emsdk install latest
-
-RUN cd /usr/src/emsdk && ./emsdk activate latest
-
-RUN cd /usr/src/emsdk && source ./emsdk_env.sh

povray_wasm/Dockerfile.alpine

@@ -0,0 +1,34 @@
+FROM frolvlad/alpine-gxx
+
+RUN apk update
+
+RUN apk add --update \
+	bash \
+	git \
+	coreutils \
+	build-base \
+	boost-dev \
+	zlib-dev \
+	libpng-dev \
+	jpeg-dev \
+	tiff-dev \
+	openexr-dev \
+	sdl-dev \
+	autoconf \
+	automake \ 
+	make
+
+RUN pwd
+
+WORKDIR /usr/src/
+
+RUN cd /usr/src/ && git clone https://github.com/emscripten-core/emsdk.git emsdk
+
+ENV POVRAY_VERSION=3.7-stable
+RUN cd /usr/src/ && git clone --depth 1 --branch $POVRAY_VERSION https://github.com/POV-Ray/povray povray
+
+RUN cd /usr/src/emsdk && ./emsdk install latest
+
+RUN cd /usr/src/emsdk && ./emsdk activate latest
+
+RUN cd /usr/src/emsdk && source ./emsdk_env.sh