ogr_fdw building dependencies and fdw under mingw64. For this I used mingw64 x86_64-4.8.3-win32-seh-rt_v3-rev1 (http://sourceforge.net/projects/mingw-w64/)

ogr_fdw_depends_build.sh

#my windows 64-bit build chain described here is available at http://www.bostongis.com/postgisstuff/ming64gcc48.7z  
#(with most of these libraries already built)
#My 32-bit chain is much the same except uses gcc 4.8.1, I'll be posting that as well after I clean it up a bit
#Paul's instructions for setting up mingw on 32-bit are pretty close in concept - https://github.com/pramsey/postgis-build-windows
#Although these are built with mingw64 chain, they are designed to work with the EDB VC++ distributions of PostgreSQL

export OS_BUILD=64
export GCC_TYPE=gcc48
PROJECTS=/projects
SOURCES=/sources

if [[ "${OS_BUILD}" == "64" ]] ; then
	export MINGHOST=x86_64-w64-mingw32
else
	export MINGHOST=i686-w64-mingw32
fi


#compile postgresql 9.5+ (can do the same for other versions of postgresql you want to build for)
# prior versions needed configure --disable-float8-byval  (from 9.5 on the VC++ builds no longer use that
# so for older put in --disable-float8-byval to be compatible with EDB VC++, and 9.5+ take it out.)
if true; then
	mkdir ${PROJECTS}/postgresql
	cd ${PROJECTS}/postgresql
	export PG_VER=9.6w${OS_BUILD}${GCC_TYPE}
	export PG_VER_FULL=9.6.2
	export PG_DIR=${PROJECTS}/postgresql/postgresql-${PG_VER_FULL}
	rm -rf postgresql-${PG_VER_FULL}
	wget http://ftp.postgresql.org/pub/source/v${PG_VER_FULL}/postgresql-${PG_VER_FULL}.tar.bz2
	tar -xvjf postgresql-${PG_VER_FULL}.tar.bz2
	
	cd postgresql-${PG_VER_FULL}
	export PATH="${PROJECTS}/rel/pg${PG_VER}/bin:${PROJECTS}/rel/pg${PG_VER}/lib:$PATH"
	 
	make distclean
	
	#if you are building for 32-bit in 9.4 you need to edit the
	#src/template/win32 and change the LDFLAGS
	#LDFLAGS="-Wl,--allow-multiple-definition -Wl,--disable-auto-import"
	# to LDFLAGS="-Wl,--allow-multiple-definition"
	
	#if you don't then the extensions you build will not work in the VC++ 32-bit PostgreSQL build
	#this is a non-issue for 64-bit build
	
	./configure --prefix=${PROJECTS}/postgresql/rel/pg${PG_VER}\
		--build=${MINGHOST} \
		--with-pgport=8443 --enable-cassert --enable-debug \
		--without-zlib
	make clean
	make
	rm -rf ${PROJECTS}/postgresql/rel/pg${PG_VER}
	make install
	make check
	#gmake install-world
	cd ${PG_DIR}/contrib/postgres_fdw
	make install
	cd ${PG_DIR}/contrib/hstore
	make
	make install
	cd ${PG_DIR}/contrib/fuzzystrmatch
	make
	make install
	cd ${PG_DIR}/contrib/pg_trgm
	make
	make install
fi

#You'll need GDAL refer to my https://gist.github.com/robe2/83be1da8b85dd83b7f950d55f5154d81#file-build_gdal_and_depends-sh
# for building the GDAL shared library and it's dependencies

##finally we can build ogr_fdw
if true; then
	cd ${SOURCES}
	export PGUSER=postgres
	export PG_VER=9.6
	export GDAL_VER=2.1.3
	#for simplicity, I copy all the dependency dlls (sql lite, ssl, curl in rel-gdal*/bin folder

	export GDAL_REL_PATH=${PROJECTS}/gdal/rel-${GDAL_VER}w${OS_BUILD}${GCC_TYPE}
	export PGWINVER=${PG_VER}w${OS_BUILD}edb
	export PGPATH=${PROJECTS}/postgresql/rel/pg${PG_VER}w${OS_BUILD}${GCC_TYPE}
	export PATH="/mingw/bin:/mingw/include:/bin:${PGPATH}/bin:${GDAL_REL_PATH}/bin"
	export PGPORT=5446
	rm -rf pgsql_ogr_fdw
	git clone -b master https://github.com/pramsey/pgsql-ogr-fdw.git pgsql_ogr_fdw
	cd pgsql_ogr_fdw
	git pull
  	make clean
	
	#since I don't build GDAL with postgresql support the postgresql test fails
	#so I sed it out
	sed -i 's/pgsql//' Makefile

  	make
  	make install
	
  	make installcheck
fi