Index: install_wx.make
===================================================================
--- install_wx.make	(revision 6227)
+++ install_wx.make	(working copy)
@@ -55,6 +55,36 @@

 $(wx_archive)-url := ftp://ftp.wxwidgets.org/pub/$(wx_version)/$(wx_archive)

+# If wx_commit_sha is defined on make command line, it overrides wx_version and
+# the commit with this SHA is retrieved from github. Otherwise the official
+# release wx_version (which can also be overridden on make command line) is
+# downloaded.
+
+ifneq ($(wx_commit_sha),)
+
+  ifneq "$(origin wx_md5)" "$(origin wx_commit_sha)"
+    $(error Please specify wx_md5 for $(wx_commit_sha) on make command line.)
+  endif
+
+  wx_version  := $(wx_commit_sha)
+
+  wx_archive := wxWidgets-$(wx_commit_sha).zip
+
+  $(wx_archive)-md5 := $(wx_md5)
+
+  $(wx_archive)-url := https://github.com/wxWidgets/wxWidgets/archive/$(wx_commit_sha).zip
+endif
+
+
+foo:
+	@echo wx_commit_sha $(wx_commit_sha)
+	@echo wx_md5 $(wx_md5)
+	@echo wx_version $(wx_version)
+	@echo wx_archive $(wx_archive)
+	@echo $(wx_archive)-md5 $($(wx_archive)-md5)
+	@echo $(wx_archive)-url $($(wx_archive)-url)
+
+
 # Variables that normally should be left alone #################################

 mingw_bin_dir := $(mingw_dir)/bin
@@ -119,6 +149,7 @@
 PATCH  := patch
 RM     := rm
 TAR    := tar
+UNZIP  := unzip
 WGET   := wget

 # Targets ######################################################################
@@ -154,6 +185,12 @@
 	cd $(cache_dir) && $(ECHO) "$(address@hidden) *$@" | $(MD5SUM) --check
 	-$(TAR) --extract $(TARFLAGS) --directory=$(wx_dir) --file=$(cache_dir)/$@

+.PHONY: %.zip
+%.zip:
+	cd $(cache_dir) && [ -e $@ ] || $(WGET) $(WGETFLAGS) --output-document=$@ $(address@hidden)
+	cd $(cache_dir) && $(ECHO) "$(address@hidden) *$@" | $(MD5SUM) --check
+	-$(UNZIP) $(cache_dir)/$@ -d $(wx_dir)
+
 .PHONY: wx
 wx:
 	../configure $(config_options) && $(MAKE) && $(MAKE) install