--- GNUmakefile.orig	2020-05-23 16:23:54 UTC
+++ GNUmakefile
@@ -83,15 +83,15 @@ endif
 
 
 # --------------------------------------------------------------------------
-# DESTDIR directory
-ifndef DESTDIR
-    DESTDIR := /usr
+# MYDESTDIR directory
+ifndef MYDESTDIR
+    MYDESTDIR := /usr
 endif
 
 # --------------------------------------------------------------------------
 # LIBDIR directory
 ifndef LIBDIR
-    LIBDIR := ${DESTDIR}/lib
+    LIBDIR := ${MYDESTDIR}/lib
 endif
 
 # --------------------------------------------------------------------------
@@ -149,7 +149,7 @@ CFLAGS += -Wall -Werror -Wshadow -Wextra -Wno-format-t
 LDFLAGS = $(CURL_LIBS) $(LIBXML2_LIBS) $(OPENSSL_LIBS) -lpthread
 
 STRIP ?= strip
-INSTALL := install --strip-program=$(STRIP)
+MYINSTALL := install --strip-program=$(STRIP)
 
 
 # --------------------------------------------------------------------------
@@ -171,12 +171,12 @@ exported: libs3 s3 headers
 
 .PHONY: install
 install: exported
-	$(QUIET_ECHO) $(DESTDIR)/bin/s3: Installing executable
-	$(VERBOSE_SHOW) $(INSTALL) -Dps -m u+rwx,go+rx $(BUILD)/bin/s3 \
-                    $(DESTDIR)/bin/s3
+	$(QUIET_ECHO) $(MYDESTDIR)/bin/s3: Installing executable
+	$(VERBOSE_SHOW) $(MYINSTALL) -Dps -m u+rwx,go+rx $(BUILD)/bin/s3 \
+                    $(MYDESTDIR)/bin/s3
 	$(QUIET_ECHO) \
         $(LIBDIR)/libs3.so.$(LIBS3_VER): Installing shared library
-	$(VERBOSE_SHOW) $(INSTALL) -Dps -m u+rw,go+r \
+	$(VERBOSE_SHOW) $(MYINSTALL) -Dps -m u+rw,go+r \
                $(BUILD)/lib/libs3.so.$(LIBS3_VER_MAJOR) \
                $(LIBDIR)/libs3.so.$(LIBS3_VER)
 	$(QUIET_ECHO) \
@@ -186,11 +186,11 @@ install: exported
 	$(QUIET_ECHO) $(LIBDIR)/libs3.so: Linking shared library
 	$(VERBOSE_SHOW) ln -sf libs3.so.$(LIBS3_VER_MAJOR) $(LIBDIR)/libs3.so
 	$(QUIET_ECHO) $(LIBDIR)/libs3.a: Installing static library
-	$(VERBOSE_SHOW) $(INSTALL) -Dp -m u+rw,go+r $(BUILD)/lib/libs3.a \
+	$(VERBOSE_SHOW) $(MYINSTALL) -Dp -m u+rw,go+r $(BUILD)/lib/libs3.a \
                     $(LIBDIR)/libs3.a
-	$(QUIET_ECHO) $(DESTDIR)/include/libs3.h: Installing header
-	$(VERBOSE_SHOW) $(INSTALL) -Dp -m u+rw,go+r $(BUILD)/include/libs3.h \
-                    $(DESTDIR)/include/libs3.h
+	$(QUIET_ECHO) $(MYDESTDIR)/include/libs3.h: Installing header
+	$(VERBOSE_SHOW) $(MYINSTALL) -Dp -m u+rw,go+r $(BUILD)/include/libs3.h \
+                    $(MYDESTDIR)/include/libs3.h
 
 
 # --------------------------------------------------------------------------
@@ -200,12 +200,12 @@ install: exported
 uninstall:
 	$(QUIET_ECHO) Installed files: Uninstalling
 	$(VERBOSE_SHOW) \
-	    rm -f $(DESTDIR)/bin/s3 \
-              $(DESTDIR)/include/libs3.h \
-              $(DESTDIR)/lib/libs3.a \
-              $(DESTDIR)/lib/libs3.so \
-              $(DESTDIR)/lib/libs3.so.$(LIBS3_VER_MAJOR) \
-              $(DESTDIR)/lib/libs3.so.$(LIBS3_VER)
+	    rm -f $(MYDESTDIR)/bin/s3 \
+              $(MYDESTDIR)/include/libs3.h \
+              $(MYDESTDIR)/lib/libs3.a \
+              $(MYDESTDIR)/lib/libs3.so \
+              $(MYDESTDIR)/lib/libs3.so.$(LIBS3_VER_MAJOR) \
+              $(MYDESTDIR)/lib/libs3.so.$(LIBS3_VER)
 
 
 # --------------------------------------------------------------------------
@@ -338,7 +338,7 @@ $(DEBPKG): exported $(BUILD)/deb/DEBIAN/control $(BUIL
            $(BUILD)/deb/usr/share/doc/libs3/changelog.gz \
            $(BUILD)/deb/usr/share/doc/libs3/changelog.Debian.gz \
            $(BUILD)/deb/usr/share/doc/libs3/copyright
-	DESTDIR=$(BUILD)/deb/usr $(MAKE) install
+	MYDESTDIR=$(BUILD)/deb/usr $(MAKE) install
 	rm -rf $(BUILD)/deb/usr/include
 	rm -f $(BUILD)/deb/usr/lib/libs3.a
 	@mkdir -p $(dir $@)
@@ -351,7 +351,7 @@ $(DEBDEVPKG): exported $(BUILD)/deb-dev/DEBIAN/control
            $(BUILD)/deb-dev/usr/share/doc/libs3-dev/changelog.gz \
            $(BUILD)/deb-dev/usr/share/doc/libs3-dev/changelog.Debian.gz \
            $(BUILD)/deb-dev/usr/share/doc/libs3-dev/copyright
-	DESTDIR=$(BUILD)/deb-dev/usr $(MAKE) install
+	MYDESTDIR=$(BUILD)/deb-dev/usr $(MAKE) install
 	rm -rf $(BUILD)/deb-dev/usr/bin
 	rm -f $(BUILD)/deb-dev/usr/lib/libs3.so*
 	@mkdir -p $(dir $@)