From 8fbd9f13400df299c8211b7b643bdbbe1ecabd77 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Sun, 29 Jan 2012 08:53:53 -0800
Subject: [PATCH] Exit when required parameters not provided to
 win32/Makefile.gcc.

---
 win32/Makefile.gcc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/win32/Makefile.gcc b/win32/Makefile.gcc
index fddd78a..c4a6589 100644
--- a/win32/Makefile.gcc
+++ b/win32/Makefile.gcc
@@ -123,6 +123,10 @@ zlibrc.o: win32/zlib1.rc
 .PHONY: install uninstall clean
 
 install: zlib.h zconf.h $(STATICLIB) $(IMPLIB)
+	@if test -z "$(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
 	-@mkdir -p $(INCLUDE_PATH)
 	-@mkdir -p $(LIBRARY_PATH) $(LIBRARY_PATH)/pkgconfig
 	-if [ "$(SHARED_MODE)" = "1" ]; then \