diff -ruNp gpsbabel-1.6.0.orig/Makefile.in gpsbabel-1.6.0/Makefile.in
--- gpsbabel-1.6.0.orig/Makefile.in	2019-05-02 10:26:47.000000000 +0200
+++ gpsbabel-1.6.0/Makefile.in	2019-08-06 03:31:17.476367571 +0200
@@ -121,7 +121,7 @@ LIBOBJS = route.o waypt.o filter_vecs.o
     src/core/textstream.o \
 	  src/core/usasciicodec.o \
 	  src/core/xmlstreamwriter.o \
-	  $(GARMIN) $(JEEPS) $(FMTS) $(FILTERS) $(SHAPE) @ZLIB@
+	  $(GARMIN) $(JEEPS) $(FMTS) $(FILTERS) $(SHAPE) @ZLIB@ @MINIZIP@
 OBJS = main.o globals.o $(LIBOBJS) @FILEINFO@
 
 DEPFILES = $(OBJS:.o=.d)
diff -ruNp gpsbabel-1.6.0.orig/config.h.in gpsbabel-1.6.0/config.h.in
--- gpsbabel-1.6.0.orig/config.h.in	2019-05-02 10:26:47.000000000 +0200
+++ gpsbabel-1.6.0/config.h.in	2019-08-06 03:32:15.346105354 +0200
@@ -21,6 +21,9 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the `minizip' library (-lminizip). */
+#undef HAVE_LIBMINIZIP
+
 /* Defined if you have libusb */
 #undef HAVE_LIBUSB
 
@@ -66,6 +69,9 @@
 /* 1 to enable as many formats as possible */
 #undef MAXIMAL_ENABLED
 
+/* 1 to inhibit our use of libminizip. */
+#undef MINIZIP_INHIBITED
+
 /* Define to the address where bug reports for this package should be sent. */
 #undef PACKAGE_BUGREPORT
 
diff -ruNp gpsbabel-1.6.0.orig/configure.ac gpsbabel-1.6.0/configure.ac
--- gpsbabel-1.6.0.orig/configure.ac	2019-05-02 10:26:47.000000000 +0200
+++ gpsbabel-1.6.0/configure.ac	2019-08-06 03:34:20.233539240 +0200
@@ -128,6 +128,22 @@ AS_CASE([$with_zlib], ["system"], [
 AC_SUBST(ZLIB_CPP)
 AC_SUBST(ZLIB)
 
+AC_MSG_CHECKING([whether to support zlib's minizip])
+AC_ARG_WITH([libminizip],
+	[AS_HELP_STRING(
+		[--with-libminizip=(included)|system|no],
+		[])])
+AS_CASE([$with_libminizip], ["system"], [
+	AC_CHECK_LIB([minizip], [zipOpen64])
+], ["no"], [
+	AC_DEFINE(MINIZIP_INHIBITED, 1, [1 to inhibit our use of libminizip.])
+	AC_MSG_RESULT([no])
+], [
+	MINIZIP="\$(MINIZIP)"
+	AC_MSG_RESULT([using included version])
+])
+AC_SUBST(MINIZIP)
+
 AS_CASE(["$target"], [*-*-mingw32*], [
 	FILEINFO=fileinfo.o
 	AS_IF([test "$CC" = "gcc"], [