diff -r -u --strip-trailing-cr zlib-1.2.11.original/configure zlib-1.2.11/configure
--- zlib-1.2.11.original/configure	2017-05-17 21:56:42.973656600 +0200
+++ zlib-1.2.11/configure	2017-05-17 21:56:42.646074500 +0200
@@ -38,6 +38,7 @@
 
 # destination name for static library
 STATICLIB=libz.a
+IMPORTLIB=
 
 # extract zlib version numbers from zlib.h
 VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
@@ -74,7 +75,7 @@
 prefix=${prefix-/usr/local}
 exec_prefix=${exec_prefix-'${prefix}'}
 libdir=${libdir-'${exec_prefix}/lib'}
-sharedlibdir=${sharedlibdir-'${libdir}'}
+sharedlibdir=${sharedlibdir-'${exec_prefix}/bin'}
 includedir=${includedir-'${prefix}/include'}
 mandir=${mandir-'${prefix}/share/man'}
 shared_ext='.so'
@@ -89,6 +90,7 @@
 debug=0
 old_cc="$CC"
 old_cflags="$CFLAGS"
+old_ldflags="$LDFLAGS"
 OBJC='$(OBJZ) $(OBJG)'
 PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'
 
@@ -213,14 +215,24 @@
         LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
         LDCONFIG="ldconfig -m" ;;
   CYGWIN* | Cygwin* | cygwin* | OS/2*)
+        CFLAGS="${CFLAGS} -D_LARGEFILE_SOURCE=1 -D_FILE_OFFSET_BITS=64"
+        SFLAGS="${CFLAGS}"
+        LDFLAGS="-L. ${old_ldflags}"
+        shared_ext=".dll"
+        SHAREDLIB='cygz.dll'
+        IMPORTLIB='libz.dll.a'
+        LDSHARED=${LDSHARED-"$cc -shared -Wl,-export-all -Wl,--enable-auto-image-base -Wl,--out-implib=${IMPORTLIB}"}
+        LDSHAREDLIBC=''
         EXE='.exe' ;;
   MINGW* | mingw*)
 # temporary bypass
-        rm -f $test.[co] $test $test$shared_ext
-        echo "Please use win32/Makefile.gcc instead." | tee -a configure.log
-        leave 1
-        LDSHARED=${LDSHARED-"$cc -shared"}
-        LDSHAREDLIBC=""
+        SFLAGS="${CFLAGS}"
+        LDFLAGS="-L. ${old_ldflags}"
+        shared_ext=".dll"
+        SHAREDLIB='zlib1.dll'
+        IMPORTLIB='libz.dll.a'
+        LDSHARED=${LDSHARED-"$cc -shared -Wl,-export-all -Wl,--enable-auto-image-base -Wl,--out-implib=${IMPORTLIB}"}
+        LDSHAREDLIBC=''
         EXE='.exe' ;;
   QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
          # (alain.bonnefoy@icbt.com)
@@ -344,11 +356,32 @@
   esac
 fi
 
+case "$uname" in
+  *CYGWIN* | *Cygwin* | *cygwin* )
+    # On cygwin, we always build both shared and static libs
+    ALL="static shared"
+    SHAREDLIBPOST='/bin/true'
+    SHAREDTARGET=${SHAREDLIB}
+    TEST="all teststatic testshared"
+    ;;
+  *MINGW* | *Mingw* | *mingw* )
+    # On Mingw, we always build both shared and static libs
+    ALL="static shared"
+    SHAREDLIBPOST='/bin/true'
+    SHAREDTARGET=${SHAREDLIB}
+    TEST="all teststatic testshared"
+    ;;
+  *)
+
 # destination names for shared library if not defined above
 SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
 SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
 SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}
-
+SHAREDLIBPOST='(rm -f $(SHAREDLIB) $(SHAREDLIBM); ln -s $@ $(SHAREDLIB) ; ln -s $@ $(SHAREDLIBM) )'
+SHAREDTARGET='$(SHAREDLIBV)'
+    ;;
+esac
+ 
 echo >> configure.log
 
 # define functions for testing compiler and library characteristics and logging the results
@@ -847,6 +880,9 @@
 echo SHAREDLIBM = $SHAREDLIBM >> configure.log
 echo SHAREDLIBV = $SHAREDLIBV >> configure.log
 echo STATICLIB = $STATICLIB >> configure.log
+echo IMPORTLIB = $IMPORTLIB >> configure.log
+echo SHAREDLIBPOST = $SHAREDLIBPOST >> configure.log
+echo SHAREDTARGET = $SHAREDTARGET >> configure.log
 echo TEST = $TEST >> configure.log
 echo VER = $VER >> configure.log
 echo Z_U4 = $Z_U4 >> configure.log
@@ -868,9 +904,12 @@
 /^LDSHARED *=/s#=.*#=$LDSHARED#
 /^CPP *=/s#=.*#=$CPP#
 /^STATICLIB *=/s#=.*#=$STATICLIB#
+/^IMPORTLIB *=/s#=.*#=$IMPORTLIB#
 /^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
 /^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
 /^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
+/^SHAREDLIBPOST *=/s#=.*#=$SHAREDLIBPOST#
+/^SHAREDTARGET *=/s#=.*#=$SHAREDTARGET#
 /^AR *=/s#=.*#=$AR#
 /^ARFLAGS *=/s#=.*#=$ARFLAGS#
 /^RANLIB *=/s#=.*#=$RANLIB#
@@ -899,9 +938,12 @@
 /^CPP *=/s#=.*#=$CPP#
 /^LDSHARED *=/s#=.*#=$LDSHARED#
 /^STATICLIB *=/s#=.*#=$STATICLIB#
+/^IMPORTLIB *=/s#=.*#=$IMPORTLIB#
 /^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
 /^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
 /^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
+/^SHAREDLIBPOST *=/s#=.*#=$SHAREDLIBPOST#
+/^SHAREDTARGET *=/s#=.*#=$SHAREDTARGET#
 /^AR *=/s#=.*#=$AR#
 /^ARFLAGS *=/s#=.*#=$ARFLAGS#
 /^RANLIB *=/s#=.*#=$RANLIB#
diff -r -u --strip-trailing-cr zlib-1.2.11.original/Makefile.in zlib-1.2.11/Makefile.in
--- zlib-1.2.11.original/Makefile.in	2017-05-17 21:56:47.364247600 +0200
+++ zlib-1.2.11/Makefile.in	2017-05-17 21:56:42.661639100 +0200
@@ -34,6 +34,9 @@
 SHAREDLIB=libz.so
 SHAREDLIBV=libz.so.1.2.11
 SHAREDLIBM=libz.so.1
+IMPORTLIB=
+SHAREDLIBPOST='(rm -f $(SHAREDLIB) $(SHAREDLIBM); ln -s $@ $(SHAREDLIB) ; ln -s $@ $(SHAREDLIBM) )'
+SHAREDTARGET=$(SHAREDLIBV)
 LIBS=$(STATICLIB) $(SHAREDLIBV)
 
 AR=ar
@@ -48,7 +51,7 @@
 prefix = /usr/local
 exec_prefix = ${prefix}
 libdir = ${exec_prefix}/lib
-sharedlibdir = ${libdir}
+sharedlibdir = ${exec_prefix}/bin
 includedir = ${prefix}/include
 mandir = ${prefix}/share/man
 man3dir = ${mandir}/man3
@@ -127,7 +130,7 @@
 	./infcover
 	gcov inf*.c
 
-libz.a: $(OBJS)
+$(STATICLIB): $(OBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS)
 	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
 
@@ -278,11 +281,9 @@
 	-@mv objs/gzwrite.o $@
 
 
-placebo $(SHAREDLIBV): $(PIC_OBJS) libz.a
+placebo $(SHAREDTARGET): $(PIC_OBJS) $(STATICLIB)
 	$(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS)
-	rm -f $(SHAREDLIB) $(SHAREDLIBM)
-	ln -s $@ $(SHAREDLIB)
-	ln -s $@ $(SHAREDLIBM)
+	$(SHAREDLIBPOST)
 	-@rmdir objs
 
 example$(EXE): example.o $(STATICLIB)
@@ -291,11 +292,11 @@
 minigzip$(EXE): minigzip.o $(STATICLIB)
 	$(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS)
 
-examplesh$(EXE): example.o $(SHAREDLIBV)
-	$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV)
+examplesh$(EXE): example.o $(SHAREDTARGET)
+	$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDTARGET)
 
-minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
-	$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV)
+minigzipsh$(EXE): minigzip.o $(SHAREDTARGET)
+	$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDTARGET)
 
 example64$(EXE): example64.o $(STATICLIB)
 	$(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS)
@@ -309,20 +310,34 @@
 	-@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi
 	-@if [ ! -d $(DESTDIR)$(man3dir)      ]; then mkdir -p $(DESTDIR)$(man3dir); fi
 	-@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi
-	rm -f $(DESTDIR)$(libdir)/$(STATICLIB)
 	cp $(STATICLIB) $(DESTDIR)$(libdir)
-	chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB)
-	-@($(RANLIB) $(DESTDIR)$(libdir)/libz.a || true) >/dev/null 2>&1
-	-@if test -n "$(SHAREDLIBV)"; then \
-	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
-	  cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir); \
-	  echo "cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)"; \
-	  chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
-	  echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV)"; \
-	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
-	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \
-	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
-	  ($(LDCONFIG) || true)  >/dev/null 2>&1; \
+	-@(chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB))
+	-@($(RANLIB) $(DESTDIR)$(libdir)/$(STATICLIB) || true) >/dev/null 2>&1
+	-@if test -n "$(IMPORTLIB)" ; then \
+		cp $(IMPORTLIB) $(DESTDIR)$(libdir); \
+		echo "cp $(IMPORTLIB) $(DESTDIR)$(libdir)"; \
+		chmod 644 $(DESTDIR)$(libdir)/$(IMPORTLIB); \
+		if test -n "$(SHAREDTARGET)" ; then \
+			if test -f "$(SHAREDTARGET)" ; then \
+				cp $(SHAREDTARGET) $(DESTDIR)$(sharedlibdir); \
+				echo "cp $(SHAREDTARGET) $(DESTDIR)$(sharedlibdir)"; \
+				chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDTARGET); \
+				echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDTARGET)"; \
+			fi; \
+		fi; \
+		if test -n "$(SHAREDLIBV)"; then \
+			if test -f "$(SHAREDLIBV)"; then \
+				rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
+				ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \
+				ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
+				($(LDCONFIG) || true)  >/dev/null 2>&1; \
+			fi; \
+		fi; \
+	else \
+		cp $(SHAREDTARGET) $(DESTDIR)$(sharedlibdir); \
+		echo "cp $(SHAREDTARGET) $(DESTDIR)$(sharedlibdir)"; \
+		chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDTARGET); \
+		echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDTARGET)"; \
 	fi
 	rm -f $(DESTDIR)$(man3dir)/zlib.3
 	cp $(SRCDIR)zlib.3 $(DESTDIR)$(man3dir)
@@ -341,12 +356,13 @@
 
 uninstall:
 	cd $(DESTDIR)$(includedir) && rm -f zlib.h zconf.h
-	cd $(DESTDIR)$(libdir) && rm -f libz.a; \
+	cd $(DESTDIR)$(libdir) && rm -f $(STATCILIB) $(IMPORTLIB); \
 	if test -n "$(SHAREDLIBV)" -a -f $(SHAREDLIBV); then \
 	  rm -f $(SHAREDLIBV) $(SHAREDLIB) $(SHAREDLIBM); \
 	fi
 	cd $(DESTDIR)$(man3dir) && rm -f zlib.3
 	cd $(DESTDIR)$(pkgconfigdir) && rm -f zlib.pc
+	cd $(DESTDIR)$(sharedlibdir) && (rm -f $(SHAREDTARGET) || true) > /dev/null 2>&1
 
 docs: zlib.3.pdf
 
@@ -369,6 +385,7 @@
 	   example$(EXE) minigzip$(EXE) examplesh$(EXE) minigzipsh$(EXE) \
 	   example64$(EXE) minigzip64$(EXE) \
 	   infcover \
+	   $(STATICLIB) $(IMPORTLIB) $(SHAREDTARGET) $(SHAREDLIBV) $(SHAREDLIBV) $(SHAREDLIBM) \
 	   libz.* foo.gz so_locations \
 	   _match.s maketree contrib/infback9/*.o
 	rm -rf objs
diff -r -u --strip-trailing-cr zlib-1.2.11.original/zconf.h.cmakein zlib-1.2.11/zconf.h.cmakein
--- zlib-1.2.11.original/zconf.h.cmakein	2017-05-17 21:56:48.237691000 +0200
+++ zlib-1.2.11/zconf.h.cmakein	2017-05-17 21:56:42.724439200 +0200
@@ -506,7 +506,7 @@
 #  define z_off_t long
 #endif
 
-#if !defined(_WIN32) && defined(Z_LARGE64)
+#if (defined(_WIN32) && defined(__GNUC__) && defined(_LARGEFILE64_SOURCE)) || defined(Z_LARGE64)
 #  define z_off64_t off64_t
 #else
 #  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
diff -r -u --strip-trailing-cr zlib-1.2.11.original/zconf.h.in zlib-1.2.11/zconf.h.in
--- zlib-1.2.11.original/zconf.h.in	2017-05-17 21:56:48.260281600 +0200
+++ zlib-1.2.11/zconf.h.in	2017-05-17 21:56:42.724439200 +0200
@@ -504,7 +504,7 @@
 #  define z_off_t long
 #endif
 
-#if !defined(_WIN32) && defined(Z_LARGE64)
+#if (defined(_WIN32) && defined(__GNUC__) && defined(_LARGEFILE64_SOURCE)) || defined(Z_LARGE64)
 #  define z_off64_t off64_t
 #else
 #  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
diff -r -u --strip-trailing-cr zlib-1.2.11.original/zlib.pc.in zlib-1.2.11/zlib.pc.in
--- zlib-1.2.11.original/zlib.pc.in	2017-05-17 21:56:48.387718500 +0200
+++ zlib-1.2.11/zlib.pc.in	2017-05-17 21:56:42.693304600 +0200
@@ -9,5 +9,5 @@
 Version: @VERSION@
 
 Requires:
-Libs: -L${libdir} -L${sharedlibdir} -lz
+Libs: -L${libdir} -lz
 Cflags: -I${includedir}