Index: Makefile
==================================================================
--- Makefile
+++ Makefile
@@ -449,76 +449,76 @@
 
 #======================================================================
 # Chicken build
 #======================================================================
 
-tgz/sqlite-autoconf-3090200.tar.gz :
-	mkdir -p tgz
-	curl http://www.sqlite.org/2015/sqlite-autoconf-3090200.tar.gz > tgz/sqlite-autoconf-3090200.tar.gz 
+tgz-$(USER)/sqlite-autoconf-3090200.tar.gz :
+	mkdir -p tgz-$(USER)
+	curl http://www.sqlite.org/2015/sqlite-autoconf-3090200.tar.gz > tgz-$(USER)/sqlite-autoconf-3090200.tar.gz 
 
-tgz/nanomsg-1.0.0.tar.gz :
+tgz-$(USER)/nanomsg-1.0.0.tar.gz :
 	wget --no-check-certificate https://github.com/nanomsg/nanomsg/archive/1.0.0.tar.gz
-	mv 1.0.0.tar.gz tgz/nanomsg-1.0.0.tar.gz	
-
-tgz/chicken-4.13.0.tar.gz :
-	mkdir -p tgz
-	curl https://code.call-cc.org/releases/4.13.0/chicken-4.13.0.tar.gz > tgz/chicken-4.13.0.tar.gz
-
-tgz/ffcall.tar.gz :
-	wget -c -O tgz/ffcall.tar.gz 'http://www.kiatoa.com/fossils/ffcall/tarball?name=ffcall&uuid=trunk'
-
-$(CHICKEN_PREFIX)/sqlite-autoconf-3090200/configure : tgz/sqlite-autoconf-3090200.tar.gz
-	mkdir -p build;
-	cd build; tar xf ../tgz/sqlite-autoconf-3090200.tar.gz
-
-$(CHICKEN_PREFIX)/lib/libnanomsg.so : tgz/nanomsg-1.0.0.tar.gz
-	cd tgz; tar -xzvf nanomsg-1.0.0.tar.gz
-	cd tgz/nanomsg-1.0.0; mkdir build; cd build;
-	cd tgz/nanomsg-1.0.0/build; cmake ../ -DCMAKE_INSTALL_PREFIX=$(CHICKEN_PREFIX)
-	cd tgz/nanomsg-1.0.0/build; make; make install
-
-$(CHICKEN_PREFIX)/chicken-4.13.0/LICENSE : tgz/chicken-4.13.0.tar.gz
-	mkdir -p build/eggs-installed
-	cd build;tar xf ../tgz/chicken-4.13.0.tar.gz
-
-tgz/opensrc.fossil :
-	cd tgz; fossil clone http://www.kiatoa.com/fossils/opensrc opensrc.fossil
-	mkdir tgz/opensrc
-	cd tgz/opensrc; fossil open --nested ../opensrc.fossil; fossil up; fossil uv sync
-
-$(CHICKEN_PREFIX)/lib/libiupweb.so : tgz/opensrc.fossil
-	cd tgz/opensrc; fossil unversioned cat libs/cd/cd-5.10_Linux26g4_64_lib.tar.gz > ../cd.tgz
-	cd tgz/opensrc; fossil unversioned cat libs/im/im-3.11_Linux26g4_64_lib.tar.gz > ../im.tgz
-	cd tgz/opensrc; fossil unversioned cat libs/iup/iup-3.19.1_Linux26g4_64_lib.tar.gz > ../iup.tgz
-	cd tgz; tar -xzf cd.tgz;
-	cd tgz; tar -xzf im.tgz;
-	cd tgz; tar -xzf iup.tgz;
-	cp tgz/include/* $(CHICKEN_PREFIX)/include/
-	cp tgz/*.so $(CHICKEN_PREFIX)/lib/
-	cp tgz/*.a  $(CHICKEN_PREFIX)/lib/
-	cp tgz/ftgl/lib/*/* $(CHICKEN_PREFIX)/lib/
+	mv 1.0.0.tar.gz tgz-$(USER)/nanomsg-1.0.0.tar.gz	
+
+tgz-$(USER)/chicken-4.13.0.tar.gz :
+	mkdir -p tgz-$(USER)
+	curl https://code.call-cc.org/releases/4.13.0/chicken-4.13.0.tar.gz > tgz-$(USER)/chicken-4.13.0.tar.gz
+
+tgz-$(USER)/ffcall.tar.gz :
+	wget -c -O tgz-$(USER)/ffcall.tar.gz 'http://www.kiatoa.com/fossils/ffcall/tarball?name=ffcall&uuid=trunk'
+
+build-$(USER)/sqlite-autoconf-3090200/configure : tgz-$(USER)/sqlite-autoconf-3090200.tar.gz
+	mkdir -p build-$(USER);
+	cd build-$(USER); tar xf ../tgz-$(USER)/sqlite-autoconf-3090200.tar.gz
+
+$(CHICKEN_PREFIX)/lib/libnanomsg.so : tgz-$(USER)/nanomsg-1.0.0.tar.gz
+	cd tgz-$(USER); tar -xzvf nanomsg-1.0.0.tar.gz
+	cd tgz-$(USER)/nanomsg-1.0.0; mkdir build-$(USER); cd build-$(USER);
+	cd tgz-$(USER)/nanomsg-1.0.0/build-$(USER); cmake ../ -DCMAKE_INSTALL_PREFIX=$(CHICKEN_PREFIX)
+	cd tgz-$(USER)/nanomsg-1.0.0/build-$(USER); make; make install
+
+$(CHICKEN_PREFIX)/chicken-4.13.0/LICENSE : tgz-$(USER)/chicken-4.13.0.tar.gz
+	mkdir -p build-$(USER)/eggs-installed
+	cd build-$(USER);tar xf ../tgz-$(USER)/chicken-4.13.0.tar.gz
+
+tgz-$(USER)/opensrc.fossil :
+	cd tgz-$(USER); fossil clone http://www.kiatoa.com/fossils/opensrc opensrc.fossil
+	mkdir tgz-$(USER)/opensrc
+	cd tgz-$(USER)/opensrc; fossil open --nested ../opensrc.fossil; fossil up; fossil uv sync
+
+$(CHICKEN_PREFIX)/lib/libiupweb.so : tgz-$(USER)/opensrc.fossil
+	cd tgz-$(USER)/opensrc; fossil unversioned cat libs/cd/cd-5.10_Linux26g4_64_lib.tar.gz > ../cd.tgz
+	cd tgz-$(USER)/opensrc; fossil unversioned cat libs/im/im-3.11_Linux26g4_64_lib.tar.gz > ../im.tgz
+	cd tgz-$(USER)/opensrc; fossil unversioned cat libs/iup/iup-3.19.1_Linux26g4_64_lib.tar.gz > ../iup.tgz
+	cd tgz-$(USER); tar -xzf cd.tgz;
+	cd tgz-$(USER); tar -xzf im.tgz;
+	cd tgz-$(USER); tar -xzf iup.tgz;
+	cp tgz-$(USER)/include/* $(CHICKEN_PREFIX)/include/
+	cp tgz-$(USER)/*.so $(CHICKEN_PREFIX)/lib/
+	cp tgz-$(USER)/*.a  $(CHICKEN_PREFIX)/lib/
+	cp tgz-$(USER)/ftgl/lib/*/* $(CHICKEN_PREFIX)/lib/
 
 EGGS=srfi-69 srfi-42 sqlite3 iup canvas-draw typed-records md5 regex-case base64 \
 format dot-locking csv-xml z3 udp hostinfo directory-utils stack dbi crypt sha1 \
 posix-extras pathname-expand csv call-with-environment-variables s11n spiffy \
 uri-common intarweb http-client spiffy-request-vars spiffy-directory-listing \
 ansi-escape-sequences test slice rfc3339 uuid-lib filepath srfi-19 sparse-vectors \
 sql-de-lite fmt readline apropos json simple-exceptions rpc trace logpro refdb
-EGGSTARG=$(addsuffix .done,$(addprefix build/eggs-installed/,$(EGGS)))
+EGGSTARG=$(addsuffix .done,$(addprefix build-$(USER)/eggs-installed/,$(EGGS)))
 EGGSTARG2=$(addsuffix .done, $(EGGS))
 
-$(CHICKEN_PREFIX)/lib/libcallback.a : tgz/ffcall.tar.gz
-	cd tgz; tar -xzvf ffcall.tar.gz 
-	cd tgz/ffcall; ./configure --prefix=$(CHICKEN_PREFIX) --enable-shared
-	cd tgz/ffcall; make CC="gcc -fPIC"; make install	
+$(CHICKEN_PREFIX)/lib/libcallback.a : tgz-$(USER)/ffcall.tar.gz
+	cd tgz-$(USER); tar -xzvf ffcall.tar.gz 
+	cd tgz-$(USER)/ffcall; ./configure --prefix=$(CHICKEN_PREFIX) --enable-shared
+	cd tgz-$(USER)/ffcall; make CC="gcc -fPIC"; make install	
 
-$(CHICKEN_PREFIX)/bin/sqlite3 : build/sqlite-autoconf-3090200/configure 
-	cd build/sqlite-autoconf-3090200; ./configure --prefix=$(CHICKEN_PREFIX); make; make install
+$(CHICKEN_PREFIX)/bin/sqlite3 : build-$(USER)/sqlite-autoconf-3090200/configure 
+	cd build-$(USER)/sqlite-autoconf-3090200; ./configure --prefix=$(CHICKEN_PREFIX); make; make install
 
 $(CHICKEN_PREFIX)/bin/csi : $(CHICKEN_PREFIX)/bin/sqlite3 $(CHICKEN_PREFIX)/lib/libiupweb.so $(CHICKEN_PREFIX)/chicken-4.13.0/LICENSE
-	cd build/chicken-4.13.0;make PLATFORM=linux PREFIX=$(CHICKEN_PREFIX) 
-	cd build/chicken-4.13.0;make PLATFORM=linux PREFIX=$(CHICKEN_PREFIX) install
+	cd build-$(USER)/chicken-4.13.0;make PLATFORM=linux PREFIX=$(CHICKEN_PREFIX) 
+	cd build-$(USER)/chicken-4.13.0;make PLATFORM=linux PREFIX=$(CHICKEN_PREFIX) install
 
 chicken : $(CHICKEN_PREFIX)/bin/csi $(EGGSTARG2)
 	echo "Fake target to build prefix chicken"
 
 nanomsg.done : $(CHICKEN_PREFIX)/lib/libnanomsg.so
@@ -537,12 +537,12 @@
 	CSC_OPTIONS="-I$(CHICKEN_PREFIX)/include -L$(CHICKEN_PREFIX)/lib" $(CHICKEN_PREFIX)/bin/chicken-install sql-de-lite > sql-de-lite.done
 
 %.done :
 	$(CHICKEN_PREFIX)/bin/chicken-install $* > $*.done
 
-build/eggs-installed/%.done : build/bin/csi $(EGGS)
-	$(CHICKEN_PREFIX)/bin/chicken-install $* > build/eggs-installed/$*.done
+build-$(USER)/eggs-installed/%.done : $(CHICKEN_PREFIX)/bin/csi $(EGGS)
+	$(CHICKEN_PREFIX)/bin/chicken-install $* > build-$(USER)/eggs-installed/$*.done
 
 #======================================================================
 # Attic
 #======================================================================