some ideas?

povray_wasm/Dockerfile

@@ -8,6 +8,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt install -y bash \
 	libjpeg-dev \
 	libtiff-dev \
 	libopenexr-dev \
+	zlib1g-dev \
 	autoconf \
 	automake \
 	make
@@ -22,7 +23,7 @@ RUN cd /opt/boost && ./b2 -j4 toolset=emscripten \
 	cxxflags="-s USE_PTHREADS=1" \
 	--prefix=/opt/libboost \
 	--build-dir=/opt/libboost_build \
-	link=static \
+	link=static,shared \
 	variant=release \
 	threading=single \
 	runtime-link=static
@@ -35,6 +36,9 @@ RUN emar q libboost_filesystem.a libboost_filesystem.bc
 RUN emar q libboost_system.a libboost_system.bc 
 RUN emar q libboost_thread.a libboost_thread.bc 
 
+
+#RUN embuilder.py build USER
+
 WORKDIR /usr/src/
 
 ENV POVRAY_VERSION=3.7-stable

povray_wasm/compile_povray_wasm.sh

@@ -1,11 +1,14 @@
 #!/bin/bash -x
 
+#ls /emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/
+#exit
+
 EMAIL="hi@mmcwilliams.com"
 NAME="Matt McWilliams"
 
-BOOST_ROOT="/opt/boost/stage/lib/"
+BOOST_ROOT="/opt/boost/stage/lib"
 
-CFLAGS="-pthread -DBOOST_THREAD_USE_LIB -s USE_BOOST_HEADERS=1 -s EXIT_RUNTIME=1 -s PTHREAD_POOL_SIZE=4"
+CFLAGS="-pthread -DBOOST_THREAD_USE_LIB -s USE_BOOST_HEADERS=1 -s EXIT_RUNTIME=1 -s PTHREAD_POOL_SIZE=4 -I/opt/boost"
 LDFLAGS="$CFLAGS -s INITIAL_MEMORY=33554432" # 33554432 bytes = 32 MB
 CONFIG_ARGS=(
   --arch=x86_32           # use x86_32 to achieve minimal architectural optimization
@@ -44,6 +47,8 @@ cd unix/
 ./prebuild.sh
 cd ../
 
+cp ./configure_mod ./configure
+
 BOOST_ROOT=$BOOST_ROOT ./configure "${ARGS[@]}"
 
 #emmake make -j CPPFLAGS="${CPPFLAGS}"

povray_wasm/configure

@@ -7837,6 +7837,7 @@ fi
 eval ac_res=\$$as_ac_Lib
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
+echo "HERE $as_as_Lib"
 if eval test \"x\$"$as_ac_Lib"\" = x"yes"; then :
   BOOST_THREAD_LIB="-l$ax_lib";  link_thread="yes"; break
 else

povray_wasm/scripts/compile.sh

@@ -2,5 +2,6 @@
 
 sudo docker run \
   -v $PWD/compile_povray_wasm.sh:/usr/src/povray/compile_povray_wasm.sh \
+  -v $PWD/configure_mod:/usr/src/povray/configure_mod \
   povray_wasm \
   sh -c 'bash compile_povray_wasm.sh'