Added a rudimentary MSVC Makefile. It still requires GNU make because nmake isn't powerful enough. I need to fix something in windows/winapi.h before it will work with Microsoft's resource compiler though...

GNUmakefile.msvc

@@ -0,0 +1,116 @@
+# 16 october 2015
+
+# TODO silence compiler non-diagnostics (/nologo is not enough)
+
+OBJDIR = .obj
+OUTDIR = out
+NAME = libui
+SUFFIX = .dll
+
+HFILES += \
+	ui.h \
+	ui_windows.h
+
+CFILES += \
+	common/areaevents.c \
+	common/control.c \
+	common/matrix.c \
+	common/menu.c \
+	common/ptrarray.c \
+	common/shouldquit.c \
+	common/types.c
+
+HFILES += \
+	common/uipriv.h
+
+CFILES += \
+	windows/alloc.c \
+	windows/area.c \
+	windows/box.c \
+	windows/button.c \
+	windows/checkbox.c \
+	windows/child.c \
+	windows/combobox.c \
+	windows/container.c \
+	windows/control.c \
+	windows/datetimepicker.c \
+	windows/debug.c \
+	windows/dialoghelper.c \
+	windows/draw.c \
+	windows/entry.c \
+	windows/events.c \
+	windows/group.c \
+	windows/init.c \
+	windows/label.c \
+	windows/main.c \
+	windows/menu.c \
+	windows/parent.c \
+	windows/progressbar.c \
+	windows/radiobuttons.c \
+	windows/resize.c \
+	windows/separator.c \
+	windows/slider.c \
+	windows/spinbox.c \
+	windows/stddialogs.c \
+	windows/tab.c \
+	windows/tabpage.c \
+	windows/text.c \
+	windows/util.c \
+	windows/utilwin.c \
+	windows/window.c
+
+HFILES += \
+	windows/compilerver.h \
+	windows/resources.h \
+	windows/uipriv_windows.h \
+	windows/winapi.h
+
+RCFILES += \
+	windows/resources.rc
+
+OFILES = \
+	$(subst /,_,$(CFILES)) \
+	$(subst /,_,$(RCFILES))
+
+OFILES := $(OFILES:%=$(OBJDIR)/%.o)
+
+# TODO /Wall does too much
+# TODO -Wno-switch equivalent
+# TODO /sdl turns C4996 into an ERROR
+# TODO loads of warnings in the system header files
+CFLAGS += \
+	/Zi \
+	/W4 /Wp64 \
+	/wd4100 \
+	/TC \
+	/analyze /bigobj /nologo \
+	/RTC1 /RTCc /RTCs /RTCu \
+	/D "_UI_EXTERN=__declspec(dllexport) extern"
+
+# TODO warnings on undefined symbols
+LDFLAGS += \
+	/dll \
+	/debug \
+	/largeadressaware /nologo \
+	user32.lib kernel32.lib gdi32.lib comctl32.lib uxtheme.lib msimg32.lib comdlg32.lib d2d1.lib ole32.lib oleaut32.lib oleacc.lib uuid.lib
+
+OUT = $(OUTDIR)/$(NAME)$(SUFFIX)
+
+$(OUT): $(OFILES) | $(OUTDIR)
+	@link /out:$(OUT) $(OFILES) $(LDFLAGS)
+	@echo ====== Linked $(OUT)
+
+.SECONDEXPANSION:
+
+$(OBJDIR)/%.c.o: $$(subst _,/,%).c $(HFILES) | $(OBJDIR)
+	@cl /Fo:$@ /c $< $(CFLAGS) /Fd$@.pdb
+	@echo ====== Compiled $<
+
+# unfortunately rc.exe does not support / as a pathname specifier
+$(OBJDIR)/%.rc.o: $$(subst _,/,%).rc $(HFILES) | $(OBJDIR)
+	@rc /nologo /v /fo $@.res $<
+	@cvtres /nologo /out:$@ $@.res
+	@echo ====== Compiled $<
+
+$(OBJDIR) $(OUTDIR):
+	@mkdir $@