support and describe building static binaries

Dockerfile.build-static

@@ -0,0 +1,98 @@
+FROM ubuntu
+RUN apt-get update -yy && \
+	apt-get install -yy git make curl pkg-config
+
+RUN curl -s https://storage.googleapis.com/golang/go1.7.linux-amd64.tar.gz | tar -C /usr/local -xzf -
+ENV GOPATH=/go
+ENV PATH=$PATH:/usr/local/go/bin:/go/bin
+RUN mkdir -p /go/bin
+
+RUN curl -sL ftp://xmlsoft.org/libxml2/libxml2-2.9.4.tar.gz | tar -xzf - && \
+  cd /libxml2-2.9.4 && \
+  ./configure \
+    --enable-static \
+    --disable-shared \
+    --without-gnu-ld \
+    --with-c14n \
+    --without-catalog \
+    --without-debug \
+    --without-docbook \
+    --without-fexceptions \
+    --without-ftp \
+    --without-history \
+    --without-html \
+    --without-http \
+    --without-iconv	\
+    --without-icu \
+    --without-iso8859x \
+    --without-legacy \
+    --without-mem-debug \
+    --without-minimum \
+    --with-output \
+    --without-pattern \
+    --with-push \
+    --without-python	\
+    --without-reader \
+    --without-readline \
+    --without-regexps \
+    --without-run-debug \
+    --with-sax1 \
+    --without-schemas \
+    --without-schematron \
+    --without-threads \
+    --without-thread-alloc \
+    --with-tree \
+    --without-valid \
+    --without-writer \
+    --without-xinclude \
+    --without-xpath \
+    --with-xptr \
+    --without-modules \
+    --without-zlib \
+    --without-lzma \
+    --without-coverage && \
+    make install
+
+RUN \
+  curl -sL ftp://ftp.openssl.org/source/openssl-1.0.2h.tar.gz | tar -xzf - && \
+  cd openssl-1.0.2h && \
+  ./config \
+    no-shared \
+    no-weak-ssl-ciphers \
+    no-ssl2 \
+    no-ssl3 \
+    no-comp \
+    no-idea \
+    no-dtls \
+    no-hw \
+    no-threads \
+    no-dso && \
+  make depend install
+
+RUN curl -sL http://www.aleksey.com/xmlsec/download/xmlsec1-1.2.22.tar.gz | tar -xzf - && \
+	cd xmlsec1-1.2.22 && \
+	./configure \
+		--enable-static \
+		--disable-shared \
+		--disable-crypto-dl \
+		--disable-apps-crypto-dl \
+		--enable-static-linking \
+		--without-gnu-ld \
+		--with-default-crypto=openssl \
+		--with-openssl=/usr/local/ssl \
+		--with-libxml=/usr/local \
+		--without-nss \
+		--without-nspr \
+		--without-gcrypt \
+		--without-gnutls \
+		--without-libxslt && \
+	make -C src install && \
+	make -C include install && \
+	make install-pkgconfigDATA
+
+ADD . /go/src/github.com/crewjam/go-xmlsec
+WORKDIR /go/src/github.com/crewjam/go-xmlsec
+RUN go get github.com/crewjam/errset
+RUN go build -tags static -ldflags '-s -extldflags "-static"' -o /bin/xmldsig ./examples/xmldsig.go
+RUN ldd /bin/xmldsig || true
+RUN /bin/xmldsig --help || true