travis: backport from master

.travis.yml

 language: python
-python:
-  - 2.7
-  - 2.6
-  - 2.5
+env:
+    - PYTHON_VER=2.4
+    - PYTHON_VER=2.5
+    - PYTHON_VER=2.6
+    - PYTHON_VER=2.7
+
+branches:
+  only:
+    - 1.6.x
+
 install:
-  - python dev.py -d
+    - deactivate
+    - make build
 
-script:
-  - bin/test
+script: make test

Makefile

+HERE = $(shell pwd)
+PYTHON_VER ?= 2.7
+PYTHON_MINOR ?= 2.7.3
+PYTHON_PATH = $(HERE)/python$(PYTHON_VER)
+
+ifeq ($(PYTHON_VER),2.6)
+	PYTHON_MINOR = 2.6.8
+endif
+
+ifeq ($(PYTHON_VER),2.5)
+	PYTHON_MINOR = 2.5.6
+endif
+
+ifeq ($(PYTHON_VER),2.4)
+	PYTHON_MINOR = 2.4.6
+endif
+
+PYTHON_ARCHIVE ?= Python-$(PYTHON_MINOR)
+PYTHON_DOWNLOAD = http://www.python.org/ftp/python/$(PYTHON_MINOR)/$(PYTHON_ARCHIVE).tgz
+PYTHON_EXE = python$(PYTHON_VER)
+
+.PHONY: all build test
+BUILD_DIRS = $(PYTHON_PATH) bin build develop-eggs eggs parts
+
+all: build
+
+$(PYTHON_PATH):
+	@echo "Installing Python"
+	mkdir -p $(PYTHON_PATH)
+	cd $(PYTHON_PATH) && \
+	curl --progress-bar $(PYTHON_DOWNLOAD) | tar -zx
+ifeq ($(PYTHON_VER),2.6)
+	cd $(PYTHON_PATH) && \
+	curl --progress-bar https://raw.github.com/collective/buildout.python/master/src/issue12012-sslv2-py26.txt > ssl.txt
+	cd $(PYTHON_PATH)/$(PYTHON_ARCHIVE) && \
+	patch -p0 < ../ssl.txt
+endif
+	cd $(PYTHON_PATH)/$(PYTHON_ARCHIVE) && \
+	./configure --prefix $(PYTHON_PATH) >/dev/null 2>&1 && \
+	make >/dev/null 2>&1 && \
+	make install >/dev/null 2>&1
+	@echo "Finished installing Python"
+
+build: $(PYTHON_PATH)
+	$(PYTHON_PATH)/bin/$(PYTHON_EXE) dev.py
+
+clean:
+	rm -rf $(BUILD_DIRS)
+
+test:
+	$(HERE)/bin/test -v

src/zc/buildout/buildout.txt

@@ -1187,13 +1187,13 @@ Set up a buildout configuration for this extension.
     ... """)
 
     >>> os.chdir(sample_buildout)
-    >>> print system(os.path.join(sample_buildout, 'bin', 'buildout')),
+    >>> print system(os.path.join(sample_buildout, 'bin', 'buildout')), # doctest: +ELLIPSIS
     Develop: '/sample-buildout/demo'
     Uninstalling myfiles.
     Getting distribution for 'recipes'.
     zip_safe flag not set; analyzing archive contents...
     Got recipes 0.0.0.
-    warning: install_lib: 'build/lib' does not exist -- no Python modules to install
+    warning: install_lib: 'build/lib...' does not exist -- no Python modules to install
 
 Verify option values.