diff --git a/extmodules/Dockerfile b/extmodules/Dockerfile
new file mode 100644
index 0000000..0a3ea31
--- /dev/null
+++ b/extmodules/Dockerfile
@@ -0,0 +1,12 @@
+FROM znc:stdonly
+
+RUN set -x \
+    && apk add --no-cache \
+        build-base \
+        icu-dev \
+        openssl-dev \
+        perl \
+        python3
+COPY znc-entrypoint.sh /
+
+ENTRYPOINT ["/znc-entrypoint.sh"]
diff --git a/extmodules/znc-entrypoint.sh b/extmodules/znc-entrypoint.sh
new file mode 100755
index 0000000..e690852
--- /dev/null
+++ b/extmodules/znc-entrypoint.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# Options.
+DATADIR="/znc-data"
+
+# Build modules from source.
+if [ -d "${DATADIR}/modules" ]; then
+    pushd "${DATADIR}/modules" > /dev/null || exit 1
+
+    # Find module sources.
+    modules=$(find "${DATADIR}/modules" -name "*.cpp")
+
+    if [ -n "$modules" ]; then
+        # Build modules.
+        echo "Building modules $modules..."
+        /opt/znc/bin/znc-buildmod $modules
+    fi
+
+    popd > /dev/null
+fi
+
+exec /opt/znc/bin/znc -f -d /znc-data $@
diff --git a/Dockerfile b/stdonly/Dockerfile
similarity index 88%
rename from Dockerfile
rename to stdonly/Dockerfile
index 6b7e4f6..e8c16c1 100644
--- a/Dockerfile
+++ b/stdonly/Dockerfile
@@ -2,6 +2,9 @@ FROM alpine:3.5
 
 ENV ZNC_VERSION 1.6.4
 
+# modperl and modpython are built, but won't be loadable.
+# :extmodules image installs perl and python3 again, making these modules loadable.
+
 ARG CONFIGUREFLAGS="--prefix=/opt/znc --enable-cyrus --enable-perl --enable-python"
 ARG CLEANCMD="apk del build-dependencies && rm -Rf /znc-src"
 ARG MAKEFLAGS=""
@@ -12,9 +15,8 @@ RUN set -x \
     && apk add --no-cache --virtual runtime-dependencies \
         icu \
         openssl \
-        python3 \
-        perl \
         cyrus-sasl \
+        ca-certificates \
     && apk add --no-cache --virtual build-dependencies \
         build-base \
         icu-dev \