diff -urpN zlib-1.2.11.orig/win32/Makefile.gcc zlib-1.2.11/win32/Makefile.gcc
--- zlib-1.2.11.orig/win32/Makefile.gcc	2017-05-23 18:52:07.937730080 -0700
+++ zlib-1.2.11/win32/Makefile.gcc	2017-05-23 19:02:24.068666463 -0700
@@ -71,7 +71,11 @@ OBJS = adler32.o compress.o crc32.o defl
        gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o
 OBJA =
 
-all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) example.exe minigzip.exe example_d.exe minigzip_d.exe
+all: $(STATICLIB) example.exe minigzip.exe
+
+ifeq ($(SHARED_MODE),1)
+all: $(SHAREDLIB) $(IMPLIB) example_d.exe minigzip_d.exe
+endif
 
 test: example.exe minigzip.exe
 	./example
@@ -125,7 +129,7 @@ zlibrc.o: win32/zlib1.rc
 .PHONY: install uninstall clean
 
 install: zlib.h zconf.h $(STATICLIB) $(IMPLIB)
-	@if test -z "$(DESTDIR)$(INCLUDE_PATH)" -o -z "$(DESTDIR)$(LIBRARY_PATH)" -o -z "$(DESTDIR)$(BINARY_PATH)"; then \
+	@if test -z "$(INCLUDE_PATH)" -o -z "$(LIBRARY_PATH)" -o -z "$(BINARY_PATH)"; then \
 		echo INCLUDE_PATH, LIBRARY_PATH, and BINARY_PATH must be specified; \
 		exit 1; \
 	fi